Warning: Spoilers ahead for "Game of Thrones" season six, including speculation of future events.
The "Game of Thrones" season six finale came just shy of explicitly confirming the series' biggest fan theories of all time. "R + L = J" is the super popular theory that states Jon Snow is the son of Rhaegar Targaryen and Lyanna Stark.
Rhaegar Targaryen was the son of the Mad King Aerys and older brother to Daenerys. He's never been seen on the show, not even in a flashback. Viewers did finally get a look at Lyanna in the finale. She was Ned Stark's younger sister, betrothed to Robert Baratheon before running away with Rhaegar and bearing his secret lovechild, Jon Snow. At least that's how the (probably true) theory goes.
In the finale, fans were given a glimpse of Lyanna Stark handing off a baby to Ned, begging him to protect it from the wrath of Robert Baratheon. After the finale aired, HBO confirmed that Jon was the son of Rhaegar and Lyanna. But for now, let's look at specific instances from the show that were foreshadowing the theory as well.
Scroll down for a complete list of moments from "Game of Thrones" that proved "R + L = J" is true.