Augustin IV
Augustine IV held what is perhaps the most powerful position in Ravnica on paper. As the Grand Arbiter of the Azorius Senate, he was the leader of Ravnica's "technical" ruling body, which is the most legal authority in the entire plane by far.
He remained in this position until he was killed by Szadek. Following his death, Leonos II took over his position.
Role:
As Grand Arbiter, he presided over the most important legal cases in Ravnica. When such cases were not in session, he would often move from courtroom to courtroom settling disputes.
Unlike many in the Azorius Senate who pride themselves on their verbosity, he is known for his brief but eloquent speech, as well as his strong personal authority.
Physical characteristics:
Blind and physically frail, he sits on a floating bench that carries him to his desired destinations. As Grand Arbiter he was protected by a soulsworn jury (spirits that swore to protect him "in life as in death").