Jasper Yeates (1745-1817) was a lawyer and Pennsylvania Supreme Court justice, one of the state's most successful colonial-era legal practitioners. After moving to Lancaster County in 1765, he became active in colonial and early federal affairs, first by supporting the Revolutionary struggle and later by serving as one of Lancaster's delegates to the State Convention of 1787, which ratified the U.S. Constitution. The Jasper Yeates Papers (1728-1910, bulk 1760-1816) consist mainly of correspondence and business and court/legal records related to the Yeates family. The bulk of this three linear foot collection reflect Yeates' personal life as husband, father, son, and friend, as well as his professional life as lawyer and judge in Pennsylvania; much of the material dated after Yeates' death was created by children and/or grandchildren.