In the legend of King Arthur and the Knights of the Round Table, the most commonly recognized twelve knights include: 1. Sir Lancelot 2. Sir Gawain 3. Sir Galahad 4. Sir Percival 5. Sir Bors 6. Sir Bedivere 7. Sir Kay 8. Sir Agravain 9. Sir Lamorak 10. Sir Tristan 11. Sir Hector 12. Sir Owain These knights are known for their chivalry and quests, including the search for the Holy Grail, and each has unique traits and stories within Arthurian legend.

In the movie "Knights of the Round Table" (1953), the character of Sir Lancelot is often portrayed as a pivotal member of King Arthur's court, but there isn't a specific "13th knight" mentioned in the traditional lore or this film. The Round Table typically symbolizes equality among the knights, with Arthur and his principal knights, including Lancelot, Gawain, and others, comprising the core group. The notion of a 13th knight may arise from interpretations or adaptations of Arthurian legends but isn’t explicitly defined in this film.

In the movie "Knights of the Round Table," the Knights of the Round Table serve as a symbol of chivalry and unity among Arthur's followers. Their primary purpose is to uphold justice, protect the realm of Camelot, and support King Arthur in his quest to establish peace and order. The Round Table itself represents equality, as all knights sit as equals, fostering camaraderie and loyalty among them. Through their adventures, they embody the ideals of bravery, honor, and the quest for the Holy Grail.

In the movie "Knights of the Round Table," King Arthur's most trusted knight is Sir Lancelot. Lancelot is portrayed as a valiant and skilled warrior, renowned for his loyalty to Arthur and his role in the legendary tales of Camelot. His character often grapples with themes of honor and love, particularly in relation to Guinevere, Arthur's queen. The film explores the complex dynamics between these characters, highlighting Lancelot's dedication to both Arthur and his own personal code of chivalry.