Note 82a — Chapter XII · OF PENBROCH
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Arnulph, younger son of Roger de Montgomery, did his homage for Dyved, and is said, by our author, to have erected a slender fortress with stakes and turf at Pembroke, in the reign of king Henry I., which, however, appears to have been so strong as to have resisted the hostile attack of Cadwgan ap Bleddyn in 1092, and of several lords of North Wales, in 1094.