Raillefal is the "shiny shiny Elvaan" who claims to be a former Temple Knight from San d'Oria. He's investigating the situation of Aht Urhgan.
Historical Background
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.
SPOILER WARNING: Details about a quest, mission or other Final Fantasy XI in-game storyline follow.
Raillefal is actually Trion, the Prince Royal of the Kingdom of San d'Oria.