When Arthur was born, Merlin contrived that he should be passed over into the care of one of King Uther's knights, Sir Ector.

Then when the lady was delivered, the king commanded two knights and two ladies to take the child bound in a cloth of gold. 'And see that ye deliver him,' he said, 'to what poor man ye meet at the postern gate of the castle.'
So the child was delivered unto Merlin, and so he bare it forth unto Sir Ector, and made an holy man to christen him, and named him Arthur.
- Malory.