Who said "I have been a slave. I know what it means to be free."?

This quote is attributed to Grey Worm.

I have been a slave. I know what it means to be free. - Grey Worm

"I have been a slave. I know what it means to be free."

Grey Worm Freedom

"I am Grey Worm. I have no name."

"Unsullied do not fear death."

"We are the dragons' soldiers."

"A soldier's duty is to obey."

"Freedom to pursue your passion is precious."

"Freedom comes at a cost."

"Order isn't restriction. It's freedom."

"Freedom comes with responsibility"