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OLCHIA, Mensura agraria, Gall. Ouche :
Fulcredus de Bœllo Pratello (Beaupreau) invadavit quondam monachis sancti Sergii Bello Pratello commanentibus duas Olchias.(Arch. de Maine-et-Loire, II. cart. de S. Serge, 308. an. 1075.)