Tydorel

Tydorel is a medieval lai which tells the story of a fairy-knight who visits the childless queen of Brittany.

Then he proves his supernatural origins by riding his horse across the bottom of an enchanted lake and emerging on the other side.

The queen continues her affair with the fairy-knight for twenty years, until a destitute knight seeking charity discovers them in each other's arms.

The king dies too, and Tydorel enjoys a prosperous rule for ten years.

Then Tydorel puts on his armor and rides his horse to the bottom of the lake to test his own mortality, but he does not return.