Who said "A good leader must understand both war and peace."?

This quote is attributed to Daenerys Targaryen.

A good leader must understand both war and peace. - Daenerys Targaryen

"A good leader must understand both war and peace."

Daenerys Targaryen War

"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."

"Some battles are worth fighting."

"Sometimes you have to become the monster to stop the monsters."

"Skynet sent me back through time to kill you."

"War teaches us the value of peace."