William Barclay Foster (1779–1855) was the father of Stephen Foster and a notable businessman in his time. He was one of the most prosperous merchants of Pittsburgh, Pennsylvania. He was a Pennsylvania state legislator and served three terms. He was also elected mayor of Allegheny City twice in his lifetime. He has been identified as a "patriot", a "lover of home" and an "outstanding servant to his community, state and government".

Lawrenceville is one of the largest neighborhood areas in Pittsburgh in the U.S. state of Pennsylvania. It is located northeast of downtown, and like many of the city's riverfront neighborhoods, it has an industrial past. The city officially divides Lawrenceville into three neighborhoods, Upper Lawrenceville, Central Lawrenceville, and Lower Lawrenceville, but these distinctions have little practical effect. Accordingly, Lawrenceville is almost universally treated as a single large neighborhood.