Who said "In unity, there is strength; in division, there is ruin."?

This quote is attributed to Themistocles.

In unity, there is strength; in division, there is ruin. - Themistocles

"In unity, there is strength; in division, there is ruin."

Themistocles

Statesman General Ancient Greece 524–460

"A man is not finished when he is defeated. He is finished when he quits."

"The victor will not be asked afterwards whether he told the truth."

"Persuasion is a far more powerful weapon than force."

"Do not despise the enemy that is down, for fortune is fickle."