Whoever pulls this sword out of the stone is the rightful ruler and king of Britain.
King Uther Pendragon finally gets the love of his life, with the help of Merlin. King Uther and Igraine get married in payment of giving up their son.
I shall take this sword to Kay.
Not long after, King Uther dies. Everyone against King Uther's wishes start fighting for the thrown. Each man saw himself as fit to be king.
All hail King Arthur!
Merlin tells the Archbishop of Canterbury and advises him to call together all the men to London. At London, there would be a sword inside of a stone, and whoever pulls it out would be the rightful king of Britain.
I will right wrong and do justice.
Sir Kay and Sir Arthur were riding to London when Kay forgot his sword behind. Arthur went back to fetch it from him, to find out the house was shut off. Fearing his adoptive brother would lose his chance of gaining glory, he remembers of the sword in the anvil in the cathedral. Without thinking, he pulls it out and brings it to Kay.
Sir Ector, Sir Kay, and Arthur sought out the Archbishop and explain what happened. Archbishop calls everyone together to the great stone and asks Arthur to pull the sword in the presence of everyone.