Events By Place Roman Empire Emperor Caracalla decrees that freemen throughout the Roman Empire are to become Roman citizens (the Constitutio Antoniniana). Papinian, Praetorian prefect, and others who refuse to defend Caracalla's murder of Geta are put to death. Construction begins on the Baths of Caracalla in Rome. Edessa becomes a Roman province. Births Deaths Liang Xing, general of the Han Dynasty Ma Teng, Prefect of Liang Province, China Ma Xiu, Second son of Ma Teng Ma Tie, Thi… (More on 212)