Vierkaiserjahr
Most of the details of Callistus' personal life and ultimate fate are unknown, although he was dead by the end of Claudius' reign. Claudius died by poison on 13 October 54. Callistus supposedly pushed his daughter Nymphidia to become one of Caligula's mistresses. Callistus' grandchild Nymphidius Sabinus later claimed to be the product of this union, and tried unsuccessfully to gain the principate in the Year of the Four Emperors.