The genealogy and chronological history of the illustrious family of Guelph or Welph [electronic resource] : one of the sons of Isenberd, earl of Altorff in swabia, the the renown'd ancestor of our soveraign lord George, King of Great Britain, France and Ireland, &c. and the territories belonging to him in Germany. With a miraculous account of the rise of that name, and the continu'd acts of provi-sence bestow'd upon the family of the Guelphs, from their first original to this day: collected from the most authentick writers of chronology and Hi-story, as Hoffman, Verstegan, Morery, and that celebrated cosmographer, Dr. Peter Heylin.