Originally Posted by
ReplicaX
If you read Ishgardian lore, you know that every house's Guard is made up of Knights. Even their shields have their house logo. The Coliseum is attached to the Gladiator's guild, where warriors from all over come to prove themselves.
Rage of Halone is a Gladiator Skill, not a PLD Job skill. It could have been adopted by the guild if it was proven and tested in the Coliseum. Where an Ishgardian is more than welcome to participate in and where the name most likely came from.