Julia Mammaea - Roman Empress wife of Emperor Severus Alexander 222-235 A.D. -
Silver Denarius 18mm (2.0 grams) Rome mint: 222-235 A.D.
Reference: RIC 335 (Severus Alexander), S 8209
IVLIAMAMAEAAVG - Diademed, draped bust right.
FELICITASPVBLICA - Felicitas standing left, leaning on column and with legs crossed, holding caduceus.

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In Roman mythology, Felicitas was the goddess or personification of good luck and success. She played an important role in Rome's state religion during the empire, and was frequently portrayed on coins. She became a prominent symbol of the wealth and prosperity of the Roman Empire.

Felicitas was unknown before the mid-2nd century BC, when a temple was dedicated to her in the Velabrum in the Campus Martius by Lucius Licinius Lucullus, using booty from his 151–150 BC campaign in Spain. The temple was destroyed by a fire during the reign of Claudius and was never rebuilt.

Another temple in Rome was planned by Julius Caesar and was erected after his death by Marcus Aemilius Lepidus on the site of the Curia Hostilia, which had been restored by Lucius Cornelius Sulla but demolished by Caesar in 44 BC. This temple no longer existed by the time of Hadrian, and its site probably lies under the church of Santi Martina e Luca.

The word felicitas, "luck", is also the source of the word and name felicity.

Julia Avita Mamaea (14 or 29 August after 180–235) was the second daughter of Julia Maesa, a powerful Roman woman of Syrian Arab origin and Syrian noble Julius Avitus. She was a niece of empress Julia Domna and emperor Septimius Severus and sister of Julia Soaemias. She was born and raised in Emesa (modern Homs, Syria).

Julia's first husband was a former consul (whose name is unknown) who died. Julia married as her second husband Syrian Promagistrate Marcus Julius Gessius Marcianus. Julia bore Marcianus two children, a daughter called Theoclia (little is known of her) and a son, Marcus Julius Gessius Bassianus Alexianus, later emperor Alexander Severus. Unlike her sister, Julia Mamaea was reported to be a virtuous woman, never involved in scandals.

As a member of the Imperial Roman family, she watched closely the death of her cousin Caracalla and the ascent to power of her nephew Elagabalus, the oldest grandson of Julia Maesa and her choice to the throne. Eventually Elagabalus and his mother Julia Soaemias proved incompetent rulers and favour fell on Alexander, Julia's son. He became emperor in 222, following Elagabalus' murder by the Praetorian Guard. Julia and her mother became regents in the name of Alexander, then 14 years old. Upon adulthood, Alexander confirmed his esteem for his mother and named her consors imperii (imperial consort). It was in this condition that she accompanied her son in his campaigns: a custom started with Julia Domna. Thus she travelled to the East, for the campaign against Parthia and to the Germania provinces. Julia Mamaea was with Alexander in Moguntiacum (modern Mainz), capital of Germania Superior, when he was assassinated by his troops. She suffered the same fate.