NIGHTBRINGER | The Arthurian Encyclopedia

Three Bestowed Horses of the Island of Britain

Slender Grey (Meinlas), horse of Caswallawn son of Beli; Pale Yellow of the Stud, horse of Lleu Skilful-Hand; and Host-Splitter, horse of Caradawg Strong-Arm.

Drudwas’ horse is listed as one of these horses in the Triads.

Red Book of Hergest | C. 1425
Text of the Mabinogion and Other Welsh Tales | John Rhys, 1887