The Provincial Councillors of Pennsylvania belongs in every American genealogical library because it covers many of the leading families of the mid-Atlantic region and includes the entire progeny of the councillors–including daughters of daughters of daughters, sons of sons of sons, cadet branches who moved west, and English, French, German and other foreign descendants. Treated especially well are the full progenies then known of several royally descended founders of the Province–the Welsh Deputy Governor Thomas and Mary (Jones) Lloyd, plus John Cadwalader, and the Scottish James Logan (plus the mostly Pennsylvania progeny of James Tilghman, son of the immigrant Richard of Maryland). Also covered are all descendants of Edward Shippen (mostly Winthrop descendants via Grosses of Boston), who include the family of traitor Benedict Arnold and the also royally descended Burds of Philadelphia, plus Willings, Binghams, Clymers, Francises, Bayards of Delaware, and Byrds of Virginia. Lloyd descendants include many of the leading Quaker and Episcopal families of Philadelphia–Moores, Whartons, Pembertons, Morrises, plus (under son-in-law Samuel Preston) Carpenters, Ellets, and Wistars. Logan descendants include Fishers, Wisters, Drinkers, and Biddles.