John Mayor, son of Thomas, was vicar of Shawbury in Shropshire. His son, Joseph Mayor was fellow of St John's College, Cambridge from 1812 to 1814 and later Rector of South Collingham in Nottinghamshire. Another son was Robert Mayor who married Charlotte Bickersteth and was one of the first missionaries in Ceylon before returning to England on health grounds and eventually becoming Rector of Acton near Nantwitch. Three of Robert's sons went up to and became fellows of St John's College: Robert Bickersteth Mayor, who became Mathematical Master at Rugby and was Rector of Frating; John Eyton Bickersteth Mayor, who was University Librarian, [Kennedy] Professor of Latin and a great proponent of vegetarianism; and Joseph Bickersteth Mayor, who became Professor of Classics at King's College London. It was the latter who married Alexandrina Jessie Grote and connected the family with another of renown. Robert and Jessie's children included R. J. G Mayor, fellow of King's and Flora Macdonald Mayor, author.