This is the history and genealogy of the Great Welsh Tract near Philadelphia granted by William Penn in 1682 and settled by a group of Welsh Quakers. The area of the tract includes the Pennsylvania townships of Merion, Radnor, and Haverford, near Philadelphia. Following introductory chapters on the causes of the Welsh exodus and the negotiations and terms of the grant, Glenn's focus is on lists and genealogies of the settlers themselves, and he brings many of the pedigrees down through the 1800s. Detailed genealogies or extensive genealogical notes are included on a number of families.