Wace,
Arthurian Chronicles: Roman de Brut
“ He who had betrayed the commandment of God, was not one to hold his realm in surety; and thus he came to an evil end. Sorrow not thereat. The man who sells his master with a kiss may not hope to spend the wages of his sin. Vortigern held Constant and his senarchy in the hollow of his hand. The king did all according to his pleasure, and granted freely to his every need. Very quickly, by reason of divers matters, Vortigern perceived that the king knew but little of the world, since he was nourished in a cloister. He remembered that the two princes were of tender age. ”
