Ariondele
The horse of the ploughboy Fergus, who aspired to become a knight and married Galiene, the Lady of Lothian, thus fulfilling his ambition. It was given to Fergus by his father.
The animal was slain during Fergus’s combat with the giant of Mount Dolereus (Dolorous Mount).
Source
Fergus | Guillaume le Clerc, 1200-1233