He married Joan de Vere, by whom he had two children, John de Warenne, 7th Earl of Surrey, and Alice de Warenne (15 June 1287 - 23 May 1338), who in turn married Edmund FitzAlan, 9th Earl of Arundel.
9th United States Congress | James Earl Jones | Edmund Burke | Prince Edward, Earl of Wessex | Louis Mountbatten, 1st Earl Mountbatten of Burma | Herbert Kitchener, 1st Earl Kitchener | Earl | Frederick Roberts, 1st Earl Roberts | Edmund Spenser | Earl of Derby | Earl Warren | Edmund Hillary | Earl of Pembroke | Robert Harley, 1st Earl of Oxford and Earl Mortimer | Edmund Wilson | Earl of Warwick | Thomas Wentworth, 1st Earl of Strafford | Edward Smith-Stanley, 14th Earl of Derby | Earl of Shrewsbury | William Pitt, 1st Earl of Chatham | Simon de Montfort, 6th Earl of Leicester | Richard Neville, 16th Earl of Warwick | Earl of Leicester | John Scott, 1st Earl of Eldon | Edmund Husserl | 9th | Robert Devereux, 2nd Earl of Essex | Robert, 1st Earl of Gloucester | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | Earl of Devon |
Lord Fitzalan, later in the day, declared that the Parliament of Southern Ireland was dissolved and "I hereby call a Parliament to be known as and styled the Provisional Parliament".
Notably, it was not convened by Viscount FitzAlan, the Lord Lieutenant of Ireland, who, under the Government of Ireland Act 1920, was the office-holder with the entitlement to convene a meeting of the House of Commons of Southern Ireland.