Saint
one who has been recognized for having an exceptional degree of holiness, sanctity, and virtue
Can a false pope become a saint?
A false pope, or antipope, is someone that tries to claim they are the true pope but the church rejects them. Hippolytus (c. 170–235 AD) headed a schismatic group as a rival to the Bishop of Rome, thus becoming an antipope. Hippolytus (c. 170–235 AD) was named a saint in the Roman Catholic Church.
Which actions could make the Catholic church consider one a false pope or antipope? What role did Hippolytus (c. 170–235 AD) play in the schismatic group against the Bishop of Rome? Is #2 a form of #1 and he still became saint?