A warrior of Arthurís court who was the son of Dremidydd.

In Gereint Drem shared the duties of gatekeeper in Caer Llion (Caerleon) with seven to nine other warriors. His master was the chief gatekeeper Glewlwyd Strong Grip.

His name means 'sight' and, according to the tales, Dremís vision was such that he could see a fly in Scotland from Cornwall.