Lamorak had long loved Margause, the queen of Orkney, Arthur's sister and the mother of Gawaine and his brethren. For this they hated him, and with treacherous intent invited their mother to a castle near Camelot, as a lure to her lover. Soon after the tournament, at which Lamorak won the prize of valor, and redoubled the hatred of Gawaine and his brothers by overcoming them in the fray, word was brought to the victorious knight that Margause was near at hand and wished to see him.
With a lover's ardor, he hastened to the castle where she was, but, as they sat in the queen's apartment in conversation, the door was suddenly flung open, and Gaheris, one of the murderous brethren, burst in, full armed and with a naked sword in his hand. Rushing in fury on the unsuspecting lovers, with one dreadful blow he struck off his mother's head, crimsoning Lamorak with her blood. He next assailed Lamorak, who, being unarmed, was forced to fly for his life, and barely escaped.
The tidings of this dread affair filled the land with dismay, and many of the good knights of Arthur's court threatened reprisal. Arthur himself was full of wrath at the death of his sister. Yet those were days when law ruled not, but force was master, and retribution only came from the strong hand and the ready sword. This was Lamorak's quarrel, and the king, though he vowed to protect him from his foes, declared that the good knight of Wales must seek retribution with his own hand.
He gained death, alas! instead of revenge, for his foes proved too vigilant for him, and overcame him by vile treachery. Watching his movements, they lay in ambush for him at a difficult place, and as he was passing, unsuspicious of danger, they set suddenly upon him, slew his horse, and assailed him on foot.
Gawaine, Mordred, and Gaheris formed this ambush, for the noble-minded Gareth had refused to take part in their murderous plot; and with desperate fury they assaulted the noble Welsh knight, who, for three hours, defended himself against their utmost strength. But at the last Mordred dealt him a death-blow from behind, and when he fell in death the three murders hewed him with their swords till scarce a trace of the human form was left.
Thus perished one of the noblest of Arthur's knights, and thus was done one of the most villanous deeds of blood ever known in those days of chivalrous war.
Before the death of Lamorak another event happened at Arthur's court which must here be told, for it was marvellous in itself, and had in it the promise of wondrous future deeds.
One day there came to the court at Camelot a knight attended by a young squire. When he had disarmed he went to the king and asked him to give the honor of knighthood to his squire.
"What claim has he to it?" asked the king. "Of what lineage is he?"
"He is the youngest son of King Pellinore, and brother to Sir Lamorak. He is my brother also; for my name is Aglavale, and I am of the same descent."