A "Viscount Hamone de Massy" is a witness to a deed in 1286 for Sir Richard de Massey. http://books.google.com/books?id=DYY1AQAAMAAJ&pg=PA431&lpg=...
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This Hamon appears to have been the same mentioned on Earwaker's chart as having the wardship over Matilda of Stockport, the daughter of Richard and Cicely of Stockport in 1307.