The character and the plot
Jorah Mormont is a knight from Bear Island who appears in Game of Thrones, the series based on George Martin's novel cycle. The show premiered in 2011 and ended in 2019. The character serves as an advisor to Daenerys Targaryen, and that role sets up the whole joke: he stays close to the heroine, takes part in her decisions, and yet remains in the shadows.
The key motif is his feelings for Daenerys. Jorah openly loves her but never gets anything back. The joke underscores that over the course of the show the heroine entered relationships with several men, including Khal Drogo, Daario Naharis, and Jon Snow, while Jorah never made that list. It's exactly this contrast that turns the character into a symbol of unrequited love.
Why it became a meme
The term "friendzone" describes a situation where one person sees the relationship as friendly while the other wants more. The phrase "king of the friendzone" transplants this everyday situation onto a character from an epic series, and the comedy comes from the mismatch between the grandeur of the show and the mundane plotline. The meme doesn't mock the character or the actor, but the storyline in which his feelings go unanswered.
The joke works even for people who haven't watched the show, thanks to the formula itself: a man who's been there for years but gets no attention is instantly recognizable. Because of that, the nickname sometimes gets applied to real-life situations where someone is going through something similar, usually in an ironic tone and without any malice.
In everyday use, the nickname is attached to situations where someone helps another person loyally for a long time without getting warmth in return. Example caption invented for illustration: "Helped with the move, fixed the laptop, listened to the story about the ex: king of the friendzone." The joke is good-natured: it sympathizes and chuckles at the same time.
Spread and usage
The meme spread through fan communities and themed pages, where stills from the show were paired with short captions. The caption "king of the friendzone" got attached to photos of the character in episodes tied to his feelings. Over time the phrase moved beyond fan circles and started being used in conversations about literature, film, and TV shows in general.
The character of the meme is ironic, without mocking the actor or his looks. The focus stays on the plot and the character's fate. The image is a standard still from the show, used only as a visual anchor for the caption. The exact date the nickname first appeared online is not known.
Cultural context
The meme shows how TV series become a source of language for the internet. Characters get nicknames that live on separately from the plot, and plot twists turn into jokes everyone understands. "Mormont, King of the Friendzone" relies on knowledge of the show, but it's understandable even without it, since it describes a familiar social situation.