Museum curator and exponent of Byzantine art. Prichard's parents were Charles Henry Prichard, a merchant, and Mattie Stewart (Prichard) (d. 1881). He attended Marlborough College in 1883 and graduated from New College, Oxford, 1887 with a law degree. He practiced briefly London. In 1892 he came under the spell a group of predominantly homosexual Oxford-educated esthetes living at Lewes House, Sussex, centered around the wealth Bostonian Edward Perry "Ned" Warren (1860-1928), his partner John Marshall (1862-1928).