Guinevere has other names.
Guinevere ( [ ˈɡwɪnᵻvɪər ] Gwenhwyfar Gwenivar ) , often written as Guenevere or Gwenevere , is , in Arthurian legend , the wife of King Arthur . She first appears as Guanhumara ( with many spelling variants in the manuscript tradition ) in Geoffrey of Monmouth 's pseudo-historical chronicle of British history , the Historia Regum Britanniae , written circa 1136 AD .