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Ordericus Vitalis, _The Ecclesiastical History_, ed. and trans. Marjorie Chibnal...
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Ordericus Vitalis, _The Ecclesiastical History_, ed. and trans. Marjorie Chibnall, 2:262-63. There is also no direct evidence to establish the year in which Earl Roger gave the Corbets their English lands, but since Earl Roger acquired the earldom of Shrewsbury in 1071, it is probable that the Corbets were enfeoffed soon afterwards.