This tiny detail just made a major Game of Thrones death even more tragic than before.

Attention: This post contains spoilers for pretty much every season of Game of Thrones. If you’re not caught up, go binge-watch first and come back.

Seven seasons down, fans of Game of Thrones know that you should never get too attached to any given character.

Even if that character seems essential to the storyline (RIP Ned Stark, Olenna Tyrell, Viserion and 1374 others).

But if there was one death that broke our hearts more than any others, it was that of Shireen Baratheon, the innocent daughter of Stannis Baratheon, who was sacrificed to the Lord of Light by Melisandre in season five.

But before she was tragically taken from fans too soon, her relationship with Ser Davos Seaworth offered up plenty of adorable and heartwarming moments in the show - a welcome change of pace from the death and destruction going on in the show.

After the big reveal about Jon Snow's real name in the season seven finale, eagle-eyed fans have spotted Shireen hinted at Jon's parentage, and Davos' eventual loyalty to the King in The North, when she was first teaching him to read.

By reading him a book about Aegon the Conquerer, Shireen inadvertently taught Ser Davos the name of the rightful heir to the Iron Throne.

"This word is Aegon," she tells Davos in the scene, which you can watch above.

"When you see 'A', 'E' and 'G' together like that, it sounds like 'egg'. And the title of the whole book is A History of Aegon the Conqueror."

The scene is made even more tragic as it shows Shireen's fascination with the Targaryen family and their conquering ways. Sadly, she would never grow up to see Jon Snow (hopefully) take his rightful place on the throne.

It seems we weren't the only ones to miss the huge clue about the fate of Westeros: Liam Cunningham, the actor who plays Davos, had no idea how meaningful the scene would become.

"Are you kidding me?" he told Huffington Post when asked if he knew Jon's real name before the rest of the world.

"I don't know what the hell's gonna happen from one episode to the next. That's testament to how good the writing is on that, too."

LISTEN: Laura and Lize discuss the everything that happened on the season seven finale of Game Of Thrones.