Lancelot was a fictional character in the Earth Camelot fairy tale set in England. He was a great knight but also a womanizer.
Kira Nerys once knocked out a hologram of Lancelot while in a holosuite of Deep Space 9 with Jadzia Dax. She was unfamiliar with the storyline and became offended when he tried to kiss her, as she was playing a married woman at the time. Dax ended the program when this happened, as the misunderstanding ruined her mood. (DS9: "The Way of the Warrior")