The Commons

meaning the common ground for pasturing cows in Allegheny City (now the North Side), and today forming part of the North Side's system of parks

as in

date 1787

authority Rimmel, William M. The Allegheny Story. Pittsburgh: Guttendorf Press, 1981, 44.

and on 9 May 1850, The Pittsburgh Daily Gazette reported that "a man was fined $1 and cost, according to ordinance, yesterday by the Mayor of Allegheny, for digging and carrying away sods from the commons."
William Rimmel, in The Allegheny Story, notes that "the common ground was the center of controversy from the start. Owners of town lots bordering on the commons claimed that the Commons Act of 1787 gave only them the right to graze their cattle there. But townspeople living outside the town site ignored them and brought not only their cattle to graze but also their hogs."

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Sources:

Works Projects Administration. Story of Old Allegheny. Pittsburgh: Allegheny Centennial Committee, 1941.