Background
Piers was the son of Sir William Piers and Martha, daughter of Sir James Ware.
Piers was the son of Sir William Piers and Martha, daughter of Sir James Ware.
Piers served as a military officer in the 1640s, commanding a company in Colonel Castle"s Regiment,
Piers held the office of Sheriff of Counties Longford and Westmeath in 1657–1658. He was dubbed a knight by Henry Cromwell at Dublin Castle on 30 November 1658 (an honour that passed into oblivion with the Restoration in May 1660). After the Restoration he was created a baronet on 18 February 1661.
He was Sheriff of Street Johnstown, County Longford between 1661 and 1666, and he held the office of Sheriff of County Westmeath in 1663.
Around 1653 Piers married Mary Jones, daughter of Doctor Henry Jones and Jane Cullum. His descendants included Sir John Piers.
He was Member of Parliament (Member of Parliament) for Counties Longford and Westmeath in the Third Protectorate Parliament of 1659.