'Game of Thrones' Spoilers: Jon Snow Confirmed as a Targaryen on Jimmy Kimmel

Jon Snow is confirmed as a Targaryen by Nikolaj Coster-Waldau on "Jimmy Kimmel Live," July 11. ABC

Warning: Spoilers ahead.

Daenerys Targaryen, the Mother of Dragons, now has a less reptilian...nephew? Yes, nephew, in the form of one Jon Snow.

Game of Thrones fans finally got confirmation last night that Jon is a Targaryen, when Nikolaj Coster-Waldau (who plays Jaime Lannister) spoke with Jimmy Kimmel about Jon's death and eventual resurrection.

"Last time you were here, I asked you, 'Is Jon Snow really dead?'" said Kimmel. "And you swore to me that he was dead."

Coster-Waldau explained that, yes, Jon Snow, the bastard son of Eddard Stark, was gone for good.

"But Jon Stark Targaryen has risen from the dead," he added.

Fans of both the show and the Song of Ice and Fire book series have long speculated about Jon's real parentage. The most popular theory, known pseudocryptically as R+L=J, proposes that Jon is actually the son of Rhaegar Targaryen, not Ned Stark, and that Lyanna Stark—Ned's sister—is Jon's mother. Rhaegar, killed before the beginning of the series, was the older brother of Daenerys Targaryen, which would make her Jon's aunt.

The Season 6 finale of Game of Thrones confirmed that Lyanna was Jon's mother. HBO soon released an infographic that seemed to label Rhaegar as his father, but fans were skeptical of the chart's credibility. Until last night, no member of the cast or crew had explicitly labeled Jon's family line as "Stark Targaryen."

The news puts a damper on fans who were hoping for a Jon-Daenerys romance in the future (although incest is a common affair in Westeros). But it does raise hopes for a hybrid direwolf-dragon army.

Game of Thrones Season 7 premieres Sunday on HBO.