William David Trimble, Baron Trimble, was a British politician who was the first First Minister of Northern Ireland from 1998 to 2002, and leader of the Ulster Unionist Party (UUP) from 1995 to 2005. He was also Member of Parliament (MP) for Upper Bann from 1990 to 2005 and Member of the Legislative Assembly (MLA) for Upper Bann from 1998 to 2007.