'WILLIAM HORTON born undoubtedly at Mowsley, Leicestershire, probably before or by 1324 as he was of majority age in 1345; died after 1381 at Mowsley; maried Agnes (-) before 1381.'
He is identified as one of "John Horton's heirs" in the Schedule and Charter of Brabazon in 1345, and is listed, with his wife Agnes, in the Poll Tax for Mowsley in 1381 [citing Lay Subsidy 133/35 in Leicester Public Record Office; cited by Horton-Smith (1943), 9].
