Who said "I have paid the iron price."?

This quote is attributed to Theon Greyjoy.

I have paid the iron price. - Theon Greyjoy

"I have paid the iron price."

Theon Greyjoy

Character in A Storm of Swords

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"A man must know what he is."

"A man is defined by his choices."

"I paid the iron price."

"The weak are meat the strong do eat."