Marsilion in single combat.  
He received his horse after the defeat of its previous owner Helmont, and after his own death, he and two of his companions had their hearts put in white marble casks and their bodies wrapped in deerskin leather. His various accomplishments in battle include lancing Aldelroth in half and chopping a hand off of [?] Marsilion in single combat.  This man's betrothed Aude was the sister of his advisor Olivier, who repeatedly tells this character to blow his horn Oliphant after his betrayal by Ganelon. For 10 points, identify this Durandal-wielding paladin whose head explodes at the Battle of Roncevaux Pass, a Muslim-fighting nephew of Charlemagne and star of a namesake chanson de geste.
He received his horse after the defeat of its previous owner Helmont, and after his own death, he and two of his companions had their hearts put in white marble casks and their bodies wrapped in deerskin leather.
{Roland} [accept all {sorts} of {linguistic} equivalents, {including} “{Orlando}”, {why} not]