All the articles available in the Arthurian legend section of the Encyclopedia Mythica:
Accolon; Agned; Agravain; Agrestes; Alain; Ambrosius Aurelianus; Amesbury; Amr; Andret; Aneirin; Anfortas; Anguish; Anna; Annales Cambriae; Argante; Aries; Arondight; Arthur; Aurelius Ambrosius; Avalon; Badon; Balan; Balin; Ban, King; Baraton; Bassas; Bedivere, Sir; Bercilak; Beste Glatissant; Blaise; Bleeding Lance; Bors; Brangaene; Broceliande; Caerleon; Caliburn; Camelot; Camlann, Battle of; Caradoc; Carduel; Carlisle; Carmarthen; Castle of Maidens; Castle Terabil; Celidon; City of the Legion; Clarissant; Claudas; Corbenic; Culhwch; Dagonet, Sir; Damas; Daniel; Dinadan; Dinidan; Dioneta; Dolorous Stroke; Douglas; Ector, Sir; Ehangwen; Elergia; Elyzabel; Emmeline; Ermeleus; Escol; Eustace; Excalibur; Fergus; Fish-Knight; Gaheris; Galahad; Galehaut; Ganieda; Garel; Gawain; Geneir; Geoffrey of Monmouth; Geraint; Gildas; Girflet; Gorlois; Grail; Green Knight, The; Guinevere; Gwalchmei; Harley Brut; Hector, Sir; Igraine; Isolde; Isolde; Joseph of Arimathea; Joyous Gard; Kay, Sir; Knights of the Round Table; Lady of the Lake; Lamorak de Galis; Lancelot; Launfal, Sir; Leodegrance; Logres; Lohengrin; Lothian; Merlin; Mordred; Morgan le Fay; Morgue le Faye; Nennius; Nimue; Owain; Pellam; Pelleas, Sir; Pelles; Pellinore; Percival, Sir; Pharamond; Questing Beast; Round Table, The; Ryons; Sagremor; Sarras; Shalott, The Lady of; Siege Perilous; Spoils of Annwfn; Tintagel; Tom Thumb; Uther Pendragon; Val Sans Retour; Walewein ende Keye; Yvain.