Pittsburgh is a city in the Commonwealth of Pennsylvania in the United States, and is the county seat of Allegheny County. Pittsburgh is located in the south west of the state, at the confluence of the Allegheny, Monongahela, and Ohio rivers. Pittsburgh is known both as "the Steel City" for its more than 300 steel-related businesses and as the "City of Bridges" for its 446 bridges.

Pittsburgh was named in 1758 by General John Forbes, in honor of British statesman William Pitt, 1st Earl of Chatham.

William Pitt (15 November 1708 – 11 May 1778) was a British statesman of the Whig group who served as Prime Minister of Great Britain in the middle of the 18th century. Historians call him Pitt of Chatham, or William Pitt the Elder, to distinguish him from his son, William Pitt the Younger, who also was a prime minister. Pitt was also known as The Great Commoner, because of his long-standing refusal to accept a title until 1766.

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