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The latter's grandson, HENRY DE , third earl of Lincoln (d. 1311 ), who added the earldom of Salisbury to the family titles by his first marriage with Margaret Longespée , was the most powerful and influential member of this family in the affairs both of England and of Wales . One of the closest counsellors of Edward I , he played a leading part in the Welsh campaigns of 1277 , 1282 , and 1294 , and in 1282 he received a grant of Rhos , Rhufoniog , and Dinmael , these territories henceforth constituting the marcher lordship of Denbigh . He founded the garrison borough of that name and was responsible for the building of its castle and town walls . One of his sons, EDMUND , was drowned in a well within the Red Tower of the castle. His other son, JOHN , having also predeceased him, he was succeeded by his daughter, ALICE , wife of Thomas , earl of Lancaster , though dower was assigned to his second wife, a Welsh lady, Joan , sister of William , sixth baron Martin of Cemais . Alice was involved in her husband's downfall, and following his execution, in March 1322 , she surrendered to the king all her territorial rights in Wales .
Professor Thomas Jones Pierce, M.A., F.S.A., (1905-1964), Aberystwyth
Published date: 1959