Roman Emperor Caracalla Head as Young Boy. Caracalla (Latin: Marcus Aurelius Severus Antoninus Augustus; 4 April 188 – 8 April 217), was Roman emperor from 209 to 217. The eldest son of Septimius Severus, he ruled jointly with his younger brother Geta until he murdered the latter in 211. Caracalla is remembered as one of the most notorious emperors because of the massacres and persecutions he authorized throughout the empire. Caracalla’s reign was also notable for the Constitutio Antoniniana, granting Roman citizenship to all freemen throughout the Roman Empire, according to historian Cassius Dio in order to increase taxation. He also debased the Roman coinage to increase the pay of the legions. He is also one of the emperors who commissioned a large public bath-house (thermae) in Rome. The remains of the Baths of Caracalla are one of the major attractions of the Italian capital.