He didn't. Not really. Years after he had been excommunicated, Rome and England faced a common enemy, and the Pop sought alliance with Henry, who had armies and other help to offer.
It was not an oveturning of what they'd previously felt toward Henry but rather a political/strategic move.
Remember, the church was as powerful a political force as any other, and needed allies as much as any country would have.
Who was the oldest of henry vll children
his wife
tudors
Henry was excommunicated on February 22, 1076.
king Henry vll
King Henry VLL of England
. Emperor Henry IV
Henry VII was Elizabeth I's grandfather but they've never met!
Pope Gregory VII
Henry Tudor (Henry Vll) was the first Tudor king. He defeated Richard lll in the Battle of Bosworth Field
Emperor Henry VI was excommunicated by Pope Celestine III.
I am not sure what your question is in reference to but the pope usually limits his powers of excommunication to heretics.