In his first couple of appearances on Game of Thrones, Euron Greyjoy was like most of his family. He was ungodly boring and tediously dull. With the arrival of the penultimate season, a newish Euron has swept across the show like a hurricane. In just a few short episodes, he has become one of the most dangerous and threatening villains that the fantasy epic has ever seen. Yet for all his dastardly deeds, Euron has remained a bit of a mystery.

There is so much to explore with Euron. He might a breath of fresh air compared to his dull relatives (albeit a super evil one), but he has almost nothing in common with them. There is no clear middle ground with him. It turns out that there is a reason for Euron’s great dissimilarities to his kin, and it’s not just because he’s just a wee bit crazy.

So let’s dive in, shall we? Here are 15 Things You Didn’t Know About Euron Greyjoy.

15. He Might Be Daario Naharis in Disguise

Daario Naharis and Euron Greyjoy in Game of Thrones Game Of Thrones: 15 Things You Didn’t Know About Euron Greyjoy

There are number of bonkers fan theories about Game of Thrones, and most have found their life in George R.R. Martin’s A Song of Ice and Fire. One of the craziest fan theories, even more than that whole Varys might be a merman thing, is that Euron is actually another beloved character. The theory, mostly based on the source material rather than the show, states that Euron is secretly Daario Naharis, or more accurately, Daario is secretly Euron.

According to the theory, when Euron originally left the Iron Islands, he took on the appearance and name of Daario. Euron then found his way into Dany’s court (and bed), only to later return to the Iron Islands to take his crown as their king. The basis for this theory is that the two are described as looking similarly in the books, Daario has a couple of unexplained absences, and Euron seems to know a lot about Dany for an outsider.

It would seem that this theory is out completely in the show. Daario and Euron are played by two different actors, three if you count Daario’s first actor. With the existence of the Faceless Men, however, no theory can really be discounted, no matter how outlandish it might seem.

14. He Should Look Very Different

Euron Crows Eye from Game of Thrones Game Of Thrones: 15 Things You Didn’t Know About Euron Greyjoy

Going along with the Daario theory, Euron has a wildly different appearance in the books. While the show has opted for a Swedish supervillain aesthetic with their Euron, in the books, he’s basically an even more flamboyant Blackbeard. Euron is a pirate through and through in the books.

Euron is described as having very dark hair and a magnificent beard. Euron’s lips have an almost constantly blue shade as well, since he frequently drinks a blue magical wine called the shade of the evening. (This drink is exactly as menacing as it sounds.) Euron’s most striking feature(s) are his eyes, however. One of Euron’s eyes is covered by an eyepatch, and this is said to be his “black eye.” This covered eye shows his true depth of madness and apathy. It is his other eye, a bright blue one, that is called his “smiling eye.”

The show Euron can’t exactly be described as looking mundane, especially in his improved and crazier form in season 7. It is probably wise that the show didn’t go quite as garish as they could have gone in bringing him to life.