Caerphili Castle—The use of the Samolus and Selago by the Druids

Can any Welsh scholar inform me of the derivation of the name of Caerphili Castle, near Cardiff? This is the Welsh spelling of it; in English it is generally spelt Caerphilly. I have seen a derivation of it from Caer-phûli, the *Castle of Haste*; but is there such a word as phûli, or rather pûli, in Welsh? Cliffe, in his *Book of South Wales*, follows a Mr. Clarke, in deriving it from Caer-Pwll, the Castle of the Pool; but this does not seem satisfactory. Is any thing known of the early history of this castle? Mr. Cliffe says, "Daines Barrington, in an essay published seventy or eighty years a…