At eighteen the Lady of the Lake decided it was time Launcelot should be knighted.
So, on St.John's eve--when mortals can see fairies--King Arthur and Sir Ector were led, by a mysterious damsel and dwarf, to a place where Pellias and the Lady of the Lake begged them to knight their protege and pupil, who was henceforth to be known as Launcelot of the Lake.
Not only did Arthur gladly bestow the accolade upon the young man, but he took him with him to Camelot.
It was as supreme honor and mark of confidence that Arthur sent Launcelot to get Guinevere.

Some legends claim these two already loved each other dearly, others that they fell in love during the journey, others still that their guilty passion was due to a love potion, and a few that Guinevere, incensed by the behavior of Arthur,--whom some of the epics do not depict as Tennyson's "blameless king,"-- proved faithless in revenge later on.

All the versions, however, agree that Launcelot cherished an incurable, guilty passion for Guinevere, and that she proved untrue to her marriage vows.

Time and again we hear of stolen meetings, and of Launcelot's deep sorrow at deceiving the noble friend whom he continues to love and admire.

This is the only blemish in his character, while Guinevere is coquettish, passionate, unfeeling, and exacting, and has little to recommend her aside from grace, beauty, and personal magnetism.