The Keeper of the Light is the religious and political leader of Mesollonia, considered by most to be the highest ranking of Iomedae's clergy. The current keeper of the light, as of Y9976*, is Caria Trianus.
The Keeper of the Light is a position one holds for life, or until voluntary retirement, at which point the regional high clergy of Iomedae convene to elect a new Keeper. The Keeper both governs the day to day operations within the Stronghold of the Light as well as serves as a religious advisor to the high clergy of the Lady of Valor.