The Complete Guide to All 21 Major Houses on Game of Thrones

Location: The Iron Islands
Motto: "We Do Not Sow"
Sigil: Golden kraken on a black background
Major members:

• Theon Greyjoy, last surviving son of Balon
• Yara Greyjoy, daughter of Balon and sister to Theon
• Euron Greyjoy, brother of Balon and King of the Iron Islands
• Balon Greyjoy, former King of the Iron Islands — Deceased

Why They Matter:
The Greyjoys have been on the back burner for a while — with the most notable exception being when Theon went and pulled that brilliant stunt of taking over Winterfell for like five minutes. However, with the murder of King Balon Greyjoy by his power-greedy brother Euron (and Euron's subsequent coronation), it looks like the rest of Westeros might need to start getting a little nervous about the Greyjoys.

Theon and Yara have delayed Euron for now by stealing his idea (and ships) to go to Meereen and make a deal with Daenerys to offer her their ships if she'll help them defeat their uncle.