Uther weds Ygerne; both recognise Arthur as their child. However, by the Celtic custom of fosterage the infant is intrusted to Sir Ector as his dalt, or foster-child, and Uther falls in battle. Arthur is later approven king by the adventure of drawing from the stone the magic sword that no other king could move. This adventure answers to Sigmund's drawing the sword from the Branstock, in the Volsunga Saga, "Now men stand up, and none would fain be the last to lay hand to the sword," apparently stricken into the pillar by Woden. "But none who came thereto might avail to pull it out, for in nowise would it come away howsoever they tugged at it, but now up comes Sigmund, King Volsung's son, and sets hand to the sword, and pulls it from the stock, even as if it lay loose before him." The incident in the Arthurian as in the Volsunga legend is on a par with the Golden Bough, in the sixth book of the AEneid. Only the predestined champion, such as AEneas, can pluck, or break, or cut the bough -"Ipse volens facilisque sequetur Si te fata vocant."All this ancient popular element in the Arthur story is disregarded by Tennyson. He does not make Uther approach Ygerne in the semblance of her lord, as Zeus approached Alcmena in the semblance of her husband, Amphitryon. He neglects the other ancient test of the proving of Arthur by his success in drawing the sword. The poet's object is to enfold the origin and birth of Arthur in a spiritual mystery. This is deftly accomplished by aid of the various versions of the tale that reach King Leodogran when Arthur seeks the hand of his daughter Guinevere, for Arthur's title to the crown is still disputed, so Leodogran makes inquiries. The answers first leave it dubious whether Arthur is son of Gorlois, husband of Ygerne, or of Uther, who slew Gorlois and married her:-"Enforced she was to wed him in her tears."The Celtic custom of fosterage is overlooked, and Merlin gives the child to Anton, not as the customary dalt, but to preserve the babe from danger. Queen Bellicent then tells Leodogran, from the evidence of Bleys, Merlin's master in necromancy, the story of Arthur's miraculous advent.
"And down the wave and in the flame was borne A naked babe, and rode to Merlin's feet, Who stoopt and caught the babe, and cried 'The King!
Here is an heir for Uther!'"