| Term | Definition |
| King Arthur | Son of Uther Pendragon; King of Britain; founder of the Knights of the Round Table |
| Avalon | Island in the Western seas where King Arthur goes at his death |
| Sir Bedivere | Last of the Knights of the Table |
| Camelot | City where Arthur's court is established |
| Sir Ector | Arthur's foster father |
| Excalibur | Arthur's sword |
| Sir Galahad | Son of Sir Launcelot and purest of Arthur's knights; succeeds in the quest for the Holy Grail |
| Sir Gareth | Gawain's brother and Arthur's nephew; assumes disguise as Beaumains |
| Sir Gawain | Nephew to King Arthur; son of Morgana; most courteous of Arthur's knights |
| Queen Guinevere | Daughter of King Lodegreaunce; Arthur's wife |
| Holy Grail | Cup used at Last Suppe; object of quests of Knights of the Round Table |
| Sir Kay | Arthur's foster brother and steward |
| Lady of the Lake | Gives Arthur his sword |
| Sir Launcelot du Lake | Greatest of the Knights of the Round Table; father of Sir Galahad |
| Merlyn | A magician; counselor to Arthur |
| Sir Modred | Arthur's nephew; plots to overthrow the king |
| Morgan le Fay | Arthur's half sister; a sorceress |
| Round Table | A wedding gift from Arthur's father-in-law; provided seats for 150 knights |