The book opens with a description of Britain’s troubled history with the Saxons. King Uther Pendragon brings only temporary peace before the country falls back into chaos. The wizard Merlin organizes a gathering on Christmas Day, when a sword driven into an anvil appears as a test to find God’s chosen king. Unable to remove the sword, the knights set up a tournament for New Year’s Day. A 16-year-old Arthur easily removes the sword, wanting the weapon for his brother, Sir Kay. Arthur proves the feat to the knights, and Sir Ector claims Arthur is the true king. Arthur is the natural son of Uther Pendragon, but Ector raised him in secret when Merlin foresaw Arthur’s great future. Arthur pledges to be a virtuous king.

Arthur gathers followers and establishes his capital in Camelot. Under threat from some unhappy minor kings, Merlin moves Arthur to Caerleon, Wales. Merlin shares the blessings Arthur received in his infancy from the Dwellers of Avalon, and the people accept him as the king who will bring peace and unity to Britain. While they feast, a squire demands vengeance for his lord, Sir Miles, who was killed by King Pellinore. Arthur bestows knighthood on Gryfelt, an eager young man, who meets Pellinore and challenges him.