| "Blessed with the holy Father's entertainment" : Roman ceremonial music as experienced by the Irish earls in Rome, 1608 | O'Regan, Noel | Article in Book | | 1993 |
| "These are not the thinges men live by now a days" : Sir John Harington's visit to the O'Neill, 1599 | Gardiner, David M. | Article in Journal | | 1999 |
| 'Slán Dé fút go hoíche' : Hugh O'Neill's murders | Morgan, Hiram | Article in Book | | 2007 |
| 'The departure of O'Neill out of Ireland' by Thomas Ryan (RHA) | Fitzgerald, Patrick | Article in Journal | | 2007 |
| 'Treason against traitors': Thomas Walker, Hugh O'Neill's would-be assassin | Morgan, Hiram | Article in Journal | | 2010 |
| 'Writings from Rome and Dublons from Spain' : the Ó Neills and St Anthony's College Louvain, 1606-1650 | Hazard, Benjamin | Article in Journal | | 2007 |
| A countess of Tyrone | Duggan, Lucy | Article in Journal | | 1947 |
| A historical study of the career of Hugh O'Neill, second earl of Tyrone, c.1550-1616 | Graham, J. K. | Thesis | | 1938 |
| Ambiguous alliances : early modern Ireland | Bradshaw, Brendan | Article in Journal | | 2005 |
| An exile of Ireland : Hugh O'Neill, prince of Ulster | Walsh, Micheline Kerney | Monograph or Collective Volume | Four Courts | 1996 |
| Battle of Castlehaven | Coleman, Michael | Article in Journal | | 2013 |
| Breaking the heart of Tyrone's rebellion? An assessment of Mountjoy's first campaigns in Ulster, May-November 1600 | O'Neill, James | Article in Journal | | 2017 |
| Brinkmanship and bad luck: Ireland, the Nine Years' War and the succession | Rapple, Rory | Article in Book | | 2014 |
| Catherine Magennis and the wives of Hugh O'Neill | Casway, Jerrold | Article in Journal | | 2016 |
| Charlemont and Sir Toby Caulfield | Wylie, Mona | Article in Journal | | 1986 |
| Corpus Christi in Rome, 1608 | Mac Craith, Mícheál | Article in Book | | 2012 |
| Cúlra is tábhacht an dáin : a leabhráin ainmnighthear d'Aodh | Ó Buachalla, Breandán | Article in Journal | | 1990 |
| Dall'isola d'Irlanda a quella di Utopia. Propaganda politica sui due fronti negli anni della rivolta di Hugh O'Neill (1595-1603) | Loverci, Francesca | Article in Journal | | 1998 |
| Death in the Lakelands: Tyrone's proxy war, 1593-4 | O'Neill, James | Article in Journal | | 2015 |
| Diplomatic preparations for Kinsale | O'Connor, Thomas | Article in Book | | 2002 |
| Discovering the O'Neill tower-house and Chichester's military fort at Castle Hill, Dungannon | Donnelly, Colm J.Logue, PaulMurray, Emily | Article in Book | | 2010 |
| Documents from Dungannon : some letters of Hugh O'Neill | | Article in Journal | | 1993 |
| East Ulster, the MacDonalds and the provincial strategies of Hugh O'Neill, earl of Tyrone, 1585-1603 | Brady, Ciaran | Article in Book | | 2009 |
| Edward Blayney | Burns, Michael | Article in Journal | | 2013 |
| Edward Boyd Barrett and the great O'Neill | Ó Conluain, Proinsias | Article in Journal | | 1991 |
| Eugenio O'Neill, caudillo de la independencia de Irlanda, con los Tercios de Flandes | Tapia Ozcariz, Enrique de | Monograph or Collective Volume | [s.n.] | 1969 |
| Faith and fatherland or queen and country? : an unpublished exchange between O'Neill and the state at the height of the Nine Years War | Morgan, Hiram | Article in Journal | | 1994 |
| Flight departure or escape? | Ó Dálaigh, Art P. | Article in Journal | | 2007 |
| Flight of the earls? Changing views on O'Neill's departure from Ireland | Smith, Murray | Article in Journal | | 1996 |
| Florence Conry, the Flight of the Earls, and native-Catholic militancy | Casway, Jerrold | Article in Journal | | 2011 |
| From Donegal to Rome by foot, boat, coach and horseback | Ó Fiaich, Tomás | Article in Journal | | 1989 |
| Gaelic lordship and Tudor conquest : Tír Eoghain, 1541-1603 | Morgan, Hiram | Article in Journal | | 2005 |
| Half-moons and villainous works | O'Neill, James | Article in Journal | | 2014 |
| Hugh O'Neill - not guilty | Morgan, Hiram | Article in Journal | | 2010 |
| Hugh O'Neill 2nd earl of Tyrone 1601-1607 : Kinsale to Rathmullan | McGurk, J. N. N. (John James Noel) | Article in Journal | | 2001 |
| Hugh O'Neill : free spirit, religious chameleon or ardent Catholic? | O'Connor, Thomas | Article in Book | | 2004 |
| Hugh O'Neill : the Flight of the Earls | Walsh, Micheline Kerney | Monograph or Collective Volume | Flight of the Earls Heritage Centre | 1991 |
| Hugh O'Neill and national identity in early modern Ireland | Iwanisziw, Susan B. | Article in Book | | 2008 |
| Hugh O'Neill and the Berminghams | Hickey, Nora | Article in Journal | | 1983 |
| Hugh O'Neill and the nine years' war in Tudor Ireland | Morgan, Hiram | Article in Journal | | 1993 |
| Hugh O'Neill in Irish historical discourse, c.1550-2021 | Canny, Nicholas | Article in Journal | | 2022 |
| Hugh O'Neill the Great | Falls, Cyril Bentham | Article in Journal | | 1963 |
| Hugh O'Neill, 2nd earl of Tyrone and Captain Thomas Lee, double-agent | McGurk, J. N. N. (John James Noel) | Article in Journal | | 2006 |
| Hugh O'Neill, earl of Tyrone, c.1550-1616 | Jefferies, Henry A. | Article in Book | | 2000 |
| Hugh O'Neill, second earl of Tyrone and the historians | McGurk, John | Article in Journal | | 2011 |
| Hugh O'Neill, the Catholic question and the Papacy | Silke, John J. | Article in Journal | | 1965 |
| Il conte di Tyrone esule a Roma | Crinó, A. M. | Article in Journal | | 1958 |
| Imtheacht na nIarlaí: an cúlra stairiúil. | Ó Donnaile, Antaine | Article in Journal | | 2010 |
| In Tyrone's shadow : Feagh McHugh O'Byrne, forgotten leader of the Nine Years War | Edwards, David, 1963- | Article in Journal | | 1998 |
| Irish warfare in the age of the military revolution : the 'Nine Years War', 1593-1603 | O'Neill, James | Thesis | | |
| Kinsale : the Spanish intervention in Ireland at the end of the Elizabethan wars | Silke, John J. | Monograph or Collective Volume | Four Courts | 2000 |
| Lament for the princes of Tyrone and Tyrconnell. Mac an Bhaird's elegy on the Ulster lords | Meehan, Helen | Article in Journal | | 2011 |
| Later relations between the Primate Peter Lombard and Hugh O'Neill | Silke, John J. | Article in Journal | | 1955 |
| Léachtaí Cholm Cille XXXVIII : Éire agus an Eoraip sa 17ú haois | | Monograph or Collective Volume | An Sagart | 2008 |
| Like sheep to the shambles? Slaughter and surrender during Tyrone's rebellion, 1593-1603 | O'Neill, James | Article in Journal | | 2018 |
| Maguire's revolt but Tyrone's war: proxy war in Fermanagh, 1593-4 | O'Neill, James | Article in Journal | | 2016 |
| Matters relating to the indictments of 'the fugitive earls and their principal adherents' | Harris, F. W. | Article in Journal | | 1983 |
| Murtagh O'Quinn. O'Neill's 'major-domo ' and the Flight of the Earls | McCavitt, John | Article in Journal | | 2012 |
| Ó Neill agus an tAos Léinn | Ó Buachalla, Breandán | Article in Book | | 2008 |
| O'Neill's frontier campaign of 1595 in mid Armagh | McGleenon, C. F. | Article in Journal | | 1994 |
| O'Sullivan Bere : the story of the fight for the southern ports and the great retreat | De Blacam, Aodh | Article in Journal | | 1947 |
| Opposites attract: Hugh O'Neill and Red Hugh O'Donnell | McGinty, Matthew | Article in Journal | | 2014 |
| Papal privileges for Ulster churches, 1608 | Mac Cuarta, Brian | Article in Journal | | 2008 |
| Parallel lives : a comparison between Jugurtha, king of Numidia and Hugh O’Neill, earl of Tyrone by Sir James Perrot | Morgan, Hiram | Article in Journal | | 2020 |
| Parley sites of Ó Néill and Ó Domhnaill in late sixteenth-century Ireland | FitzPatrick, Elizabeth | Article in Book | | 2004 |
| Policy and propaganda in Hugh O'Neill's connection with Europe | Morgan, Hiram | Article in Book | | 2010 |
| Red Hugh and Rose O'Neill | Donnelly, Morwena | Article in Journal | | 1986 |
| Richard Weston agus 'Beir mo bheannacht go Dundalk | Ó Fiaich, Tomás | Article in Journal | | 1970 |
| Rothe's Castle, Dundalk and Hugh O'Neill : a sixteenth century map | O'Sullivan, Harold | Article in Journal | | 1965 |
| San Pietro in Montorio, burial-place of the exiled Irish in Rome | FitzPatrick, Elizabeth | Article in Journal | | 2007 |
| Shakespeare, Spenser, and the crisis in Ireland | Highley, Christopher | Monograph or Collective Volume | Cambridge University Press | 1997 |
| Sir John Davies in Cavan in 1606 and 1610 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1961 |
| Sixteenth-century Ulster and the failure of Tudor reform | Brady, Ciarán | Article in Book | | 1989 |
| Spanish intervention in Ireland, 1601-2 : Spanish bibliography | Silke, John J. | Article in Journal | | 1963 |
| Strangers to that land : British perceptions of Ireland from the Reformation to the famine | | Monograph or Collective Volume | Smythe | 1994 |
| Taking sides in early modern Ireland : the case of Hugh O'Neill, earl of Tyrone | Canny, Nicholas P. | Article in Book | | 2003 |
| The "Flight of the Earls": new light from a Roman necrology | Troy, KieranÓ Fearghail, Fearghus | Article in Journal | | 2010 |
| The "Irish road" : military supply and arms for Elizabeth's army during the O'Neill rebellion in Ireland, 1598-1601 | Stewart, R. W. | Article in Book | | 1991 |
| The army of Ulster, 1593-1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The battle of Clontibret | Ó Mearáin, Lorcán | Article in Journal | | 1956 |
| The Battle of the Yellow Ford | Logue, PaulO'Neill, James | Article in Journal | | 2007 |
| The birth date of Hugh O'Neill, 2nd Earl of Tyrone | Graham, J. K. | Article in Journal | | 1938 |
| The buannadha : Irish professional soldiery of the sixteenth century | Ó Báille, M. | Article in Journal | | 1946 |
| The career of Hugh O'Neill, earl of Tyrone, from 1603 to 1607 | Canny, Nicholas P. | Thesis | | 1967 |
| The defence of the Moyry Pass, 1600 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1957 |
| The deputy's defence: Sir William Fitzwilliam's Apology on the outbreak of the Nine Years War in Ireland | Morgan, Hiram | Article in Journal | | 2014 |
| The earl of Essex and Ireland, 1599 | Henry, L. W. | Article in Journal | | 1959 |
| The earls in popular memory | Morley, Vincent | Article in Book | | 2010 |
| The early life of Hugh O'Neill | Graham, J. K. | Article in Journal | | 1939 |
| The fallen chieftain : the tomb of Hugh O'Neill, Earl of Tyrone at San Pietro de Montorio, Rome | Mongan, Norman | Article in Journal | | 1984 |
| The flight of the Earl : Hugh O'Neill as an index of Irish cultural liminality | O'Brien, Eugene | Article in Book | | 2005 |
| The Flight of the Earls | Mac Curtain, Margaret | Article in Book | Arlen House | 2019 |
| The flight of the earls | Ó Cianáin, Tadhg, c.1575-1610 | Monograph or Collective Volume | | 1916 |
| The flight of the earls | McCavitt, John | Monograph or Collective Volume | Gill & Macmillan | 2002 |
| The flight of the earls | Boyle, Alexander | Article in Journal | | 1955 |
| The flight of the earls | Mac Curtain, Margaret | Article in Book | | 1986 |
| The flight of the Earls : a popular history | Swords, Liam | Monograph or Collective Volume | Columba | 2007 |
| The Flight of the Earls : escape or strategic regrouping | McGurk, J. N. N. (John James Noel) | Article in Journal | | 2007 |
| The flight of the earls, 1607 | McCavitt, John | Article in Journal | | 1994 |
| The Genesis of John Speed's Maps of Battles in England and Ireland | Goffart, Walter | Article in Journal | | 2004 |
| The great O'Neill. A biography of Hugh O'Neill, Earl of Tyrone, 1550-1616 | O'Faolain, Sean | Monograph or Collective Volume | Longmans Green ; Mercier Press | 1942 |
| The growth of Irish military strength in the second half of the 16th century | Falls, Cyril Bentham | Article in Journal | | 1954 |
| The Irish appeal of 1593 to Spain : some light on the genesis of the 'Nine Years' War' | Silke, John J. | Article in Journal | | 1959 |
| The Irish Peter Lombard | Silke, John J. | Article in Journal | | 1975 |
| The landowners of the late Elizabethan Pale : 'The Generall hosting appointed to meet at ye Hill of Tarrah on the 24 of September 1593' | Scott, Brendan | Article in Journal | | 2006 |
| The landowners of the late Elizabethan Pale: 'The Generall Hosting appointed to meet at ye Hill of Tarrah on the 24 of September 1593' | | Article in Journal | | 2012 |
| The last years of Hugh O'Neill : Rome, 1608-16 | Walsh, Micheline | Article in Journal | | 1969 |
| The long shadow of Seán O'Faoláin's 'Great O'Neill' | Morgan, Hiram | Article in Journal | | 2016 |
| The making of an O'Neill | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1970 |
| The Nine Years War, 1593 - 1603 : O'Neill, Mountjoy and the military revolution | O'Neill, James | Monograph or Collective Volume | Four Courts | 2017 |
| The O'Neill memorials at Donaghmore and Dundee | O'Neill, Pat | Article in Journal | | 2016 |
| The O'Neills of the Fews | Ó Fiaich, Tomás | Article in Journal | | 1977 |
| The plight of the earls : Tyrone and Tyrconnell's 'Grievances' and Crown coercion in Ulster, 1603-7 | Edwards, David, 1963- | Article in Book | | 2010 |
| The political background to the Ulster plantation, 1607-1620 | McCavitt, John | Article in Book | | 1993 |
| The Prince of Orange and the earl of Tyrone | Morrissey, Thomas J. | Article in Journal | | 1960 |
| The sojourn of the Ulster Earls at Louvain (November 1607 until February 1608) : movement, meetings and partings | McEvoy, James | Article in Journal | | 2008 |
| The state of the realm : English military, political, and diplomatic responses to the flight of the earls, autumn 1607 to spring 1608 | Harris, F. W. | Article in Journal | | 1980 |
| The tide of victory and defeat, 1 : The battle of Clontibret, 1595; 2 : The battle of Kinsale, 1601 | Hayes-McCoy, G. A. (Gerard Anthony) | Article in Journal | | 1949 |
| The tomb of Hugh O'Neill in San Pietro in Montorio in Rome | Ó Fearghail, Fearghus | Article in Journal | | 2008 |
| The too perfect hero: Hugh O'Neill: historiography and mythology | Smith, Murray Joseph | Thesis | | 1994 |
| The treaty of Mellifont and the reorganisation of Ulster, 1603 | Canny, Nicholas P. | Article in Journal | | 1969 |
| The wives of Hugh O'Neill, second earl of Tyrone | Lyons, Mary Ann | Article in Journal | | 2007 |
| Thomas Walker and the Earl of Tyrone | Morgan, Hiram | Article in Journal | | 2010 |
| True likenesses? The search for authentic portraits of the Great O'Neills | Morgan, Hiram | Article in Journal | | 2011 |
| Tyrone's rebellion : the outbreak of the nine years' war in Tudor Ireland | Morgan, Hiram | Monograph or Collective Volume | Boydell | 1993 |
| Tyrone's rebellion: Hugh O'Neill and the outbreak of the Nine Years War | Finnegan, Micheal David | Thesis | | 2001 |
| West Cork and the first flight of the Irish Wild Geese | O'Donovan, Perry | Article in Journal | | 2008 |
| Why did the earl of Tyrone join the flight? | Finnegan, David | Article in Book | | 2010 |