Lesser Prophet

The most prominent of the San 'Shyuum governors are the "Hierarchs". However, councilors or "Lesser Prophets" are extremely important in the Covenant society. They share power with the Sangheili on the High Council and wear antigrav belts instead of using gravity thrones for fast travel.

When not in the presence of the Hierarchs they appear to wear amber crowns set with gem stones. They appear to be slightly higher than Sangheili Councilors at least in military proceedings as the Prophet of Stewardship in Halo: The Flood ordered the execution by decapitation of the Councilor Soha 'Rolamee for failure to contain the Flood, though given that Stewardship was already disregarding Thel 'Vadamee's authority, this execution may have been illegal.

Trivia
It would appear that only San 'Shyuum who are members of the High Council are referred to as "prophets". In continuation, only San 'Shyuum who are seated in the High Council have used the "Prophet of..." naming scheme.