The king left no stone unturned in his campaign to subdue Wales once and for all, initiating an unprecedented, no-expense-spared programme of castle-building.
Trodd y brenin bob carreg yn ei ymgyrch i ddarostwng Cymru unwaith ac am byth, gan ddechrau rhaglen ddigynsail o adeiladu cestyll, heb arbed unrhyw gost.