That was Ulf the White in House of the Dragon — the drunk-turned- dragonseeds character who ends up bonding with Silverwing. The “drank blood” part is likely a mix-up with the Targaryen blood imagery around dragon-riding and Valyrian lore, not a literal habit of his.

Who he is

Ulf starts out as a rough, drunken commoner in King’s Landing, then is revealed to have Targaryen blood and becomes one of the dragonseeds. By the end of that storyline, he claims Silverwing and is set up as a major player in the Dance of the Dragons.

Why people mention blood

In House of the Dragon , blood matters because dragonriding is tied to Valyrian/Targaryen ancestry. That’s probably why the scene or discussion around Ulf got described with “blood,” even though the show’s official storyline is about claiming a dragon, not literally drinking blood.

Quick scoop

  • Character: Ulf the White.
  • Trait: first introduced as a drunk.
  • Dragon: Silverwing.
  • Context: the Dragonseeds and the Targaryen civil war.

TL;DR

If you meant the guy who wanted to be a dragon rider, it’s Ulf the White. If you meant an actual blood-drinking rumor, that sounds like fandom chatter rather than the show itself.