Chansons De Geste
Ogier makes his first appearance in Chanson de Roland from the 11th century, and later in a number of rhyme chronicles from the 12th to 14th centuries, where his life is elaborated on considerably with several adventures.
According to his legend, he is the son of Geoffrey, king of Denmark. In La Chevalerie Ogier de Danemarche, he had a son who was slain by Charlot, son of Charlemagne. Seeking revenge, Ogier sought out and slew Charlot, and was only barely prevented from killing Charlemagne. He resisted Charlemagne for seven years but made peace with him to fight at Charlemagne's side against the Saracens, in which battle he slew the giant Brehus.
Ogier the Dane had a sword named Curtana which, according to legend, bore the inscription "My name is Cortana, of the same steel and temper as Joyeuse and Durendal."
Read more about this topic: Ogier The Dane