Who said "Mercy is strength, not weakness. This I have learned."?

This quote is attributed to Daenerys Targaryen.

Mercy is strength, not weakness. This I have learned. - Daenerys Targaryen

"Mercy is strength, not weakness. This I have learned."

Daenerys Targaryen Kindness

"I am the blood of Old Valyria. I am the dragon."

"A dragon is not a slave."

"I will take what is mine with fire and blood."

"The night is dark and full of terrors, but so is the day."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."