Unidentified Arbiter (War of Beginnings) (Earth-2042)

"Led by a mighty Arbiter, the Sangheili resisted our entreatment with ruthless force, leading to decades of war."

- Minister of Discovery

An Arbiter led the Sangheili Council of City States in the War of Beginnings against the Reformist San'Shyuum.

Source

 * https://www.halopedia.org/Unidentified_Arbiter_(War_of_Beginnings)