Raillefal (aka Prince Trion) is the "shiny shiny Elvaan" from San d'Oria. He's investigating the situation of Aht Urhgan Whitegate
His introduction contains the line "You shall call me Raillefal!" in the English version of the game. This is a reference to the anime, manga, and novel series Crest of the Stars, where the main female character Lafaiel introduces herself with an identical line.