The site of Prysor castle lies high in a steep valley controlling the
route from Bala to Tremadog. It has no known history before King
Edward I stayed there while surveying his new lands in Wales after the
fall of Prince Llywelyn ap Gruffydd (d.1282). That the castle
does not appear again in the written record would suggest that the king
found his sojourn here uncomfortable and the upkeep of this isolated
fortress was considered no longer necessary. We have no idea who
built the castle, other than the suggestion that it was a predecessor
of Prince Llywelyn.
The ruins consist of a large pile of stones, often wrongly described as
a motte. An old print shows that this was once a stone tower
which has now collapsed in on itself. Towards the rising hillside
was a weak bailey, in which there are the remains of buried portions of
what appears to be a hall block, unless it was a later farm.
Paul Martin Remfry