Answer:
The election of two popes.
The start of protesntantism.
Step-by-step explanation:
The catholic church had a strong political influece all over the European empires because it was the church that ratified and gave validation to all of the monarchs, when two popes were elected the church got divided and the empires that liked better one or the other took sides, along with that a big wave of protestantism rose in the church with new churches being founded, it weaken the power of the Roman Catholic church.