'House of the Dragon' just introduced a big-mouthed new character — but he's probably going to be important later on

Ollie Upton/HBO

• "House of the Dragon" introduced Ulf, a common man who claims to be a Targaryen bastard.
• His claim may have merit — in "Fire and Blood," he proves to be a pivotal character.
• Here's who Ulf is in "Fire and Blood," and what happens to him in the book. 

Warning: Spoilers ahead for "House of the Dragon" season two, episode three, and the book "Fire and Blood."

This...