What is "moriaen"

Moriaen (also spelled Moriaan, Morien) is a 13th-century Arthurian romance in Middle Dutch. A 4,720-line version is preserved in the vast Lancelot-Compilatie, and a short fragment exists at the Royal Library at Brussels. The work tells the story of Morien, the Moorish son of Aglovale, one of King Arthur's Knights of the Round Table.