Sir William Warren (died 1602)

Sir William Warren (c.1558-1602) was an Irish landowner, statesman and soldier of the late sixteenth century. He is mainly remembered now for having facilitated the celebrated marriage of Hugh O'Neill, Earl of Tyrone and his third wife Mabel Bagenal, which took place at Warren's private residence, Drumcondra Castle.

Warren was the son of Captain Humphrey Warren (died 1561) and Elizabeth Clifford (died 1581). His father, a professional soldier of English birth, had come to Ireland in the service of the English Crown in about 1550 and retained the confidence of three successive monarchs. Humphrey was a close associate of Thomas Radclyffe, 3rd Earl of Sussex, Lord Deputy of Ireland 1556-1558, and he sat in the Irish House of Commons as member for Carrickfergus in the Parliament of 1559. His marriage was a most advantageous one. Elizabeth Clifford was the daughter and co-heiress of Sir Nicholas Clifford of Sutton Valence and Bobbing in Kent, and his wife Maria Harper, and the widow of Sir William Brabazon, the Vice-Treasurer of Ireland, and of Christopher Blount, a cousin of Baron Mountjoy. After Humphrey's death she made a fourth marriage to Sir John Moore. William was thus born into the heart of the Anglo-Irish nobility: he was a half-brother of Edward Brabazon, 1st Baron Ardee, and of Garret Moore, 1st Viscount Moore. His grandmother Mary Harper was the sister of Sir George Harper, a politician of some importance in the reign of Henry VIII, to whom the Harper family had a distant connection by marriage through his fifth Queen Catherine Howard. Another powerful connection was Sir Conyers Clifford, Lord President of Connaught (died 1599), who was his second cousin on his mother's side.

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