King Arthur and his Knights by Thomas Bulfinch

King Arthur proclaimed a solemn tournament to be held at Winchester. The king, not less impatient than his knights for this festival, set off some days before to superintend the preparations, leaving the queen with her court at Camelot. Sir Launcelot, under pretence of indisposition, remained behind also. His intention was to attend the tournament in disguise; and having communicated his project to Guenever, he mounted his horse, set off without any attendant, and, counterfeiting the feebleness of age, took the most unfrequented road to Winchester, and passed unnoticed as an old knight who was going to be a spectator of the sports. Even Arthur and Gawain, who happened to behold him from the windows of a castle under which he passed, were the dupes of his disguise. But an accident betrayed him. His horse happened to stumble, and the hero, forgetting for a moment his assumed character, recovered the animal with a strength and agility so peculiar to himself, that they instantly recognized the inimitable Launcelot. They suffered him, however, to proceed on his journey without interruption, convinced that his extraordinary feats of arms must discover him at the approaching festival.

In the evening Launcelot was magnificently entertained as a stranger knight at the neighboring castle of Shalott. The lord of this castle had a daughter of exquisite beauty, and two sons lately received into the order of knighthood, one of whom was at that time ill in bed, and thereby prevented from attending the tournament, for which both brothers had long made preparation. Launcelot offered to attend the other, if he were permitted to borrow the armor of the invalid, and the lord of Shalott, without knowing the name of his guest, being satisfied from his appearance that his son could not have a better assistant in arms, most thankfully accepted the offer. In the meantime the young lady, who had been much struck by the first appearance of the stranger knight, continued to survey him with increased attention, and, before the conclusion of supper, became so deeply enamoured of him, that after frequent changes of color, and other symptoms which Sir Launcelot could not possibly mistake, she was obliged to retire to her chamber, and seek relief in tears. Sir Launcelot hastened to convey to her, by means of her brother, the information that his heart was already disposed of, but that it would be his pride and pleasure to act as her knight at the approaching tournament. The lady, obliged to be satisfied with that courtesy, presented him her scarf to be worn at the tournament.