Maron Greyjoy

"No. Not here. Not in my hearing. You will not name him brother, this son of the man who put your true brothers to the sword."

- Balon to Theon Greyjoy

Maron Greyjoy is an unseen character in Game of Thrones. He is deceased when the events of the series begin and is not expected to appear in the series. Maron is the son of Balon Greyjoy, the Lord Reaper of Pyke. He was killed fighting for his father in the Greyjoy Rebellion.

Background
Maron was the second son of Balon Greyjoy and Alannys Harlaw. Balon is the head of House Greyjoy and the Lord Reaper of Pyke. Maron has two brothers, Rodrik - the oldest - and Theon - the youngest -, and a sister, Yara, born after Maron. Maron became his father's heir after Rodrik died in battle, and was himself by a collapsing tower during the Siege of Pyke.

Season 1
Tyrion wonders what Balon would make of Theon's loyalty to House Stark given that he is Balon's only surviving son.

In the books
In the A Song of Ice and Fire novels, Maron was killed defending the South tower on Pyke during the Greyjoy Rebellion.

In A Dance with Dragons it is revealed that Maron and Rodrik used to bully Theon.