The St. John Genealogy: De Port–St. John details the true descendants of Adam de Port and Mabel de Orval. It corrects numerous conflations with the St. John families of Oxford, Devon, Wales, Ireland, and colonial America, revealing the authentic origin of the de Port–St. Johns of Fonmon Castle. This 800-page scholarly volume integrates documentary evidence, heraldic seals, and verified primary citations to reconstruct the de Port–St. John transitions and their influence on later English nobility and colonial descendants.
