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 | Pedigree Chart|  |  |  |  |  |  |  |  |  |  |  | | 8 John TRETHEWEY (*) b: 1375 in Treverbyn, Cornwall County, England
 m:
 d: in Treverbyn, Cornwall County, England
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 |  |  |  |  |  |  |  |  |  | | 4 William TRETHEWEY (*) b: 1400
 m:
 d: 1457
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | 9 (Unknown) UNKNOWN (TRETHEWAY) (*) b: 1380
 d:
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 |  |  |  |  |  | | 2 Roger TRETHEWEY (*) b: 1430 in Southampton, Southampton, Hampshire, England
 m:
 d: 1522 in West Yorkshire, England
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | 5 Cecilia SPEEDE (*) b: 1396
 d: 1460
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | 1 George TREADWAY (*) b: 1462 in England, United Kingdom
 m:
 d: 1522 in Buckinghamshire, England
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | | 3 Johanna UNKNOWN (TRETHEWEY) (*) b: 1439
 d: 1522
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