Who said "A throne is no prize for the unworthy."?

This quote is attributed to Stannis Baratheon.

A throne is no prize for the unworthy. - Stannis Baratheon

"A throne is no prize for the unworthy."

Stannis Baratheon Justice

Character in A Clash of Kings

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"A man without honor is no man at all"

"In the wars to come, I need men of courage."

"A man should know why he fights."

"The throne is not a gift, it must be seized"

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."