One fairly well-known example is that of King Mark of Cornwall. He appears prominently in the Arthurian legends about Tristan and Isolde. He is described as Tristan’s uncle by marriage.

The legend of Tristan and Isolde is a particularly famous part of the Arthurian legends. This story, about which many modern films have been made, portrays the love between the two titular characters.

Popular culture has long been fascinated with the legends and myths surrounding King Arthur. This is an understandable impulse, given how so many great works of literature — from Malory’s Le ...