To find out more, click on UK Tour: Castles!
Pontefract garners a mention in Shakespeare's Richard III:
Pomfret, Pomfret! O thou bloody prison,
Fatal and ominous to noble peers!
Within the guilty closure of thy walls
Richard the second here was hack'd to death;
And, for more slander to thy dismal seat,
We give thee up our guiltless blood to drink.