Pope defied "World’s Most Powerful Man"

He wanted the Pope to get his approval. The Pope refused.

He wanted the Pope to resign. The Pope refused.

He promoted heretical theology by force. The Pope condemned it.

He sent troops to take the Pope into custody.

He had the Pope tortured, publicly ridiculed, and exiled to a famine zone.

Pope St. Martin I starved to death in 655: the last Pope to be martyred. His memory is celebrated on this day.