I found a John Lavenham I b. 1400; d. 1487 in Sheering, Essex, England. His wife is Mary De Gatesbury b. 1405 in Gatesbury Manor, Sheering, Essex, England; d. 1490 Sheering, Essex, England. Their son is John Lavenham II b. 1425; d. 1487. Looking for this family.