sentences:  Among the castles possibly built during Bernard's lordship to defend the entrances to Brycheiniog from the southeast were Tretower, Blaen Llyfni (not attested before 1207–1215), and Crickhowell.Bernard also extensively enfeoffed his followers with Welsh land.Richard fitz Pons may have been enfeoffed at Cantref Selyff on the western border of Brycheiniog and immediately he began in miniature the process whereby Bernard had come to rule Brycheiniog.