Who said "Loyalty means nothing if you lack power to back it."?

This quote is attributed to Joffrey Baratheon.

Loyalty means nothing if you lack power to back it. - Joffrey Baratheon

"Loyalty means nothing if you lack power to back it."

Joffrey Baratheon Friendship

"You are not the king, Lord Stark. I am."

"I should have beaten you harder when I had the chance."

"Everyone who isn't us is beneath us."

"I'll have you killed if you speak to me like that again."

"Friendship is built on trust and honesty."

"True friendship is worth more than gold."

"Good friends are like stars, always there even when you can't see them."

"Friendship means sacrifice."