Alan Ceoche/la Coche/la Zouche; mentioned in connection with his elder brother's grant; also witnessed the latter's grant of a charter founding Lantenac Abbey; had established himself in England by 1172, where he seems to have held land in Devon and Northants, if not elsewhere, being referred to in the Devon instance as Alan la Zouche; married Alice, daughter and eventual heir of Philip de Belmeis, of Tong, Salop, and Ashby, Leics, among other places, and died 1190. [Burke's Peerage]
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ALAN CEOCHE, or LA COCHE, otherwise LA ZOUCHE, younger brother of Eudon, or Eon, VICOMTE OF PORHOÀT, sometime (1148-56) recognized jure uxoris as DUKE OF BRITTANY, both being sons of Geoffrey, VICOMTE OF PORHOÀT (died 1141), by Hawise, daughter of Alan FERGANT, DUKE OF BRITTANY, assented to his brother Eudon's charter to the Abbey of Marmoutier in 1153. He is first mentioned in England in 1172, when the sheriff of Northants answered for the scutage due from one knight's fee on his lands; there are many references to him in lawsuits, 1175-90, and as Alan la Zouche of North Molton he was fined in Devon in 1185. He married Alice, daughter and (eventually) heir of Philip de BELMEIS, of Tong, Salop, Ashby, co. Leicester, &c., by Maud, daughter and coheir of William LE MESCHIN, of Skipton-in-Craven. He died 1190. [Complete Peerage XII/2:930-1, (transcribed by Dave Utzinger)]