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Stevenson. J. (ed). Chronica de Mailros. Edinburgh: the Societatis Edinburgesis ...
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Stevenson. J. (ed). Chronica de Mailros. Edinburgh: the Societatis Edinburgesis (1835), (A.D. 1235: "Item, desponsata est domina Mariori, soror domini Alexandri regis Scottorum apud Beruuich, in die sancti Petri ad vincula [August 1], cujus desponsationi interfuit ipse rex et magnates ejus regni, sicut ex altera parte dominus G. Anglie marschallus et comes de Penbruch, qui eam duxit in uxorem, cummultis nobilibus viris Anglie."), p. 147.