The Earldom of Clanwilliam was created in the Peerage of Ireland in 1776. The Earl also held the Irish titles of Viscount Clanwilliam (created 1766) and Baron Gillford (1766), and the Peerage of the United Kingdom title of Baron Clanwilliam (1828). The Peerage of Ireland is the term used for those peers created by British monarchs in their capacity as Lord or King of Ireland. ... The Peerage of the United Kingdom comprises most peerages created in the United Kingdom of Great Britain and Ireland after the Act of Union in 1801. ...