Hodor has been a mainstay of "Game of Thrones" for most of its run, and in this week's episode we finally learned how he got his name. (Warning: Hodorable fan-made door stops inspired by show spoilers ahead...)

Bran visited the past and warged into a young Hodor, known then as Wyllis... See video: ‘Game of Thrones’ Creators Apologize for ‘Annoying’ Hodor Jokes From Fans

See video: ‘Game of Thrones’ Star Peter Dinklage Destroys Conan in Latest ‘Clueless Gamer’

The magical possession caused Wyllis' mind to break... Also Read: ‘Game of Thrones': Did Bran Stark Cause the Mad King’s Downfall?

Also Read: ‘Game of Thrones': Bran’s Visions Reveal Hodor’s Origin

Wyllis could hear Meera in the present screaming "Hold the door!"  Also Read: ‘Game of Thrones': Hodor Actor Predicted Character’s Fate Three Years Ago

Wyllis repeated the phrase over and over until it was condensed to "Hodor." Also Read: Emilia Clarke on Scorching ‘Game of Thrones’ Nude Scene: ‘That Ain’t No Body Double’

Hodor.