Supreme Commander
From Halopedia, the Halo wiki
Template:Covenant Character Infobox Supreme Commander is a Covenant Sangheili (Elite) rank.
Rank
In the known Elite rank structure, the Supreme Commanders are the fourth-highest ranking Elites, beneath only the Councilors, Arbiters, and Imperial Admirals.
Supreme Commanders are probably the Covenant equivalent of Vice Admirals and Admirals/Lieutenant Generals and Generals.
Appearance
Physical
The Supreme Commander armor is depicted as clad in bright violet armor, with a long cloak that wraps around his shoulders.
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This particular Supreme Commander was a friend and superior to Rtas 'Vadumee, and would later become the Arbiter. Interestingly enough, this same Commander wears gold Zealot armor in his trial at High Charity. This change in armor could be assumed the outcome of simply not being a Supreme Commander anymore. The future Arbiter was still a Ship Master prior to and during his trial before the High Council and thus still wore the armor of his rank. So Far only one has been seen. During The Civil War of the Covenant, it is possible the Brutes usurped these positions.