Edward I’s decision, announced on 17 November 1276, to go against Llywelyn as a rebel and disturber of the peace, had, as not the least notable of its consequences, the inauguration in Wales of a programme of castle-building of the first magnitude.
THE HISTORY OF THE KING’S WORKS, HMSO, 1963
Maître Jacques, castle builder from St. George,
Savoy, walked the crag’s perimeter
two hundred feet above the breaking sea
that would ensure supplies during sieges,
and advised the king in what was due course then –