His letters to Anne show evidence of a deep affection between the husband and wife.
[1] A leading supporter of the Catholic James II, he was a member of the Irish Council.
He sat in the Patriot Parliament of 1689 which took punitive measures against Irish Protestants who had risen in support of James' nephew William III.
In 1691, Sarsfield was attainted by the now Williamite-controlled Irish Parliament, losing his title and estates.
He never seems to have made any effort to claim the title, although he had two sons, as well as a celebrated daughter, Catalina Sarsfield.