With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Guinevere was a King.
text_B: Guinevere -LRB- -LSB- ˈɡwɪnᵻvɪər -RSB- Gwenhwyfar Gwenivar -RRB- , often written as Guenevere or Gwenevere , is , in Arthurian legend , the wife of King Arthur .. King Arthur. King Arthur. She first appears as Guanhumara -LRB- with many spelling variants in the manuscript tradition -RRB- in Geoffrey of Monmouth 's pseudo-historical chronicle of British history , the Historia Regum Britanniae , written circa 1136 AD .. Historia Regum Britanniae. Historia Regum Britanniae. She is also found in medieval Welsh prose , in the mid-late 12th-century tale Culhwch and Olwen , as Arthur 's wife Gwenhwyfar .. medieval Welsh prose. medieval Welsh literature. In medieval romances , one of the most prominent story arcs is Queen Guinevere 's love affair with her husband 's chief knight , Lancelot .. romances. Chivalric romance. Lancelot. Lancelot. This story first appeared in Chretien de Troyes 's Lancelot , the Knight of the Cart and became a motif in Arthurian literature , starting with the Lancelot-Grail of the early 13th century and carrying through the Post-Vulgate Cycle and Thomas Malory 's Le Morte d'Arthur .. Lancelot. Lancelot. Chretien de Troyes. Chretien de Troyes. Lancelot-Grail. Lancelot-Grail. Post-Vulgate Cycle. Post-Vulgate Cycle. Thomas Malory. Thomas Malory. Le Morte d'Arthur. Le Morte d'Arthur. Guinevere and Lancelot 's betrayal of Arthur preceded his eventual defeat at the Battle of Camlann by Mordred .. Lancelot. Lancelot. Battle of Camlann. Battle of Camlann. Mordred. Mordred
related.