Zelienople is a borough in Butler County, Pennsylvania, 28 miles north of Pittsburgh. It was named for the eldest daughter of Baron Dettmar Basse, whose chosen name was Zelie. Baron Basse arrived in 1802 from Germany, and purchased a tract of 10,000 acres of land in Butler and Beaver counties. He proceeded to lay out a village and build his own private residence, a three story castle, complete with towers, turrets and battlements.