From Halopedia, the Halo wiki
The Prophet of Fortitude is a San'Shyuum of the Covenant Empire. In mid-2552, the Prophet was responsible for supply convoys in Sub-sector 35. Shipmaster Thon 'Talamee, commanding the carrier Clarity of Faith set to escort a supply convoy, noted that the Prophet would surely discipline him for tardiness if they delayed a slipspace jump. The Prophet of Fortitude was noted as having a "shrill" voice.