Patrick Sarsfield (ca. 1660 – 21 August 1693), created the first Earl of Lucan, Irish Jacobite and soldier, belonged to an Anglo-Norman family long settled in Ireland.
Sarsfield was born in Lucan c. 1660. His father, Patrick Sarsfield, married Anne O'Moore, daughter of Rory (Roger) O'Moore, who organized the Irish Rebellion of 1641. The family was of Norman origin (by this time the origin was known as "Old English") and possessed an estate with an income of £2,000 a year. Patrick, who was a younger son, entered Dongan's Regiment of Foot on 6 February 1678.
In his early years he is known to have challenged Lord Grey for a supposed reflection on the veracity of the Irish people (September 1681), and in the December of that year he was run through the body in a duel in which he engaged as second.
In 1682-83 while in London, Sarsfield took part in two abductions of heiresses. In May 1682 he helped his friend Captain Robert Clifford to abduct Ann Siderlin, a wealthy widow, and was considered lucky not to be prosecuted. Then he abducted Elizabeth Herbert, the widowed daughter of Lord Chandos, on his own account.