William Barclay Foster
William Barclay Foster (1779 - 1855) was an American businessperson. He was the father of Stephen Foster, a well-known songwriter. People  have written about Foster. They have called him one of the most prosperous merchants of Pittsburgh, Pennsylvania. He worked in the state of Pennsylvania as a state legislator. He was also elected mayor of Allegheny City two times. (Allegheny City is now part of the city of Pittsburgh.) He married Eliza Clayland Tomlinson on November 14, 1807, in Chambersburg, Pennsylvania.