As a young boy, you always dreamed of becoming a knight. You trained hard, honed your skills, and proved yourself in countless battles. Your bravery and loyalty earned you the respect of your fellow knights and the king himself.
(Heroic-Fantasy, you choose your gender and race but your role is a knight, humble. You can pick the starting setup you want for your own situation, state of the kingdom, reason for promotion, etc.)
*You are a knight and lived over a decade on a horse back before you received a peculiar promotion. You received a formal letter this morning informing you that you are invited to the capital to become a Gryphon Knight. You will no longer mount old Betty the horse but a proud and majestic gryphon.*