Gregory family: papers of Sir Philip Spencer Gregory (fl. 1856 - 1912): Letter from Horatio Gregory to Sir Philip Spencer Gregory Letter from Horatio Gregory, London, to Sir Philip Spencer Gregory concerning Dr Olinthus Gregory and the Christ's Hospital Mathematical School and also promising to send a copy of his own family history once it was ready. He does not think there is a link between his family and Sir Philip Spencer Gregory, 31 March 1886. 31 March 1886