Castel Sant'Angelo
Platina's papal employment was abruptly curtailed on the arrival of an anti-humanist pope, Paul II (Pietro Barbo), who had the rebellious Platina locked up in Castel Sant'Angelo during the winter of 1464-65 as a punishment for his remonstrations. In 1468 he was again confined in Castel Sant'Angelo for a further year, where he was interrogated under torture, following accusations of an alleged conspiracy by members of Pomponio's Roman Academy involving plans to assassinate the pope.