A leader of a battalion of soldiers in the Duke of Lorraine’s brigade, fighting for the Roman army in Arthur’s war with Rome. The Duke of Dutchmen led his soldiers into a trap set by Sir Gawaine and Sir Florence in north Italy. The soldiers were killed and the Duke fled the field.
Malory alone mentions this character, which seems to correspond to Algere of the Alliterative Morte Arthure.
Source
Le Morte Darthur | Sir Thomas Malory, 1469-1470