When Lancelot arrives later , she is instantly smitten , and they have an affair that eventually leads to Arthur 's fall .
This version of the legend has Guinevere betrothed to Arthur early in his career , while he was garnering support .
When Lancelot arrives later , Guinevere is instantly smitten , and they have an affair that eventually leads to Arthur 's fall .
This version of the legend has Guinevere betrothed to Arthur early in his career , while he was garnering support .