From the Suikoden III Manual:
The captain of a small unit in the frontier defense forces of the Holy Kingdom of Harmonia. Geddoe closely watches the hostilities between Grassland and the Zexen Federation. He must confirm rumors that the Fire Bringer has returned - perhaps to sweep victoriously once again across Grassland and then disappear. If history is to be remade, none shall doubt that this one-eyed man will have something to say about it, even if it means infiltrating Grassland alone."
The Tenjyu Star of Suikoden III, Geddoe is one of the three "primary" characters in the game.