vindicator

noun

vin·​di·​ca·​tor ˈvin-di-ˌkā-tər 

plural vindicators

: a person or thing that vindicates something or someone

They saw George, who had served with distinction against France in the War of the Spanish Succession, as a British warrior king, the vindicator of European Protestantism, and thus the defender of the balance of power.

—Brendan Simms

They falsely have cast themselves as the defender of rights and vindicator of the vulnerable.

—US Official News

John Quincy Adams expressed this view definitively when he remarked that the United States "goes not abroad in search of monsters to destroy. She is the well-wisher to the freedom and independence of all. She is the champion and vindicator only of her own."

—James P. Rubin

Word History

First Known Use

1566, in the meaning defined above