Stableboy

A Stableboy is an unnamed minor character in Game of Thrones. He is played by guest star Hugo Culverhouse and only appears in the eighth episode of the first season.

Season 1
He tries to stop Arya Stark as she retrieves Needle from a baggage cart in the Red Keep. She stabs him in the belly, killing him.

In the books
In the Song of Ice and Fire novels, his death is the same.