Decennalia
Encyclopedia
Decennalia were Ancient Roman festivals celebrated with games every ten years by the Roman emperors.

This festival owed its origin to the fact that in 27 BC
27 BC
Year 27 BC was either a common year starting on Sunday, Monday or Tuesday or a leap year starting on Monday of the Julian calendar and a common year starting on Sunday of the Proleptic Julian calendar...

, Augustus
Augustus
Augustus ;23 September 63 BC – 19 August AD 14) is considered the first emperor of the Roman Empire, which he ruled alone from 27 BC until his death in 14 AD.The dates of his rule are contemporary dates; Augustus lived under two calendars, the Roman Republican until 45 BC, and the Julian...

 refused the supreme power offered to him for life. Instead, he would only consent to accepting power for ten years; during the festival, he would surrender up all of his authority to the hands of the people, who, filled with joy, and charmed with the goodness of Augustus, immediately delivered it back to him again. The memory was preserved to the last ages of the empire by Decennalia, which was solemnised by subsequent emperors every tenth year of their reign, although they had received the imperium for life, and not for the limited period of ten years.

During the festival, the people offered up vows to the emperor, called vota decennalia, for the success and perpetuity of his empire. Roman coinage was specially modified during this time to indicate the undertaking of these vows, such as with the inscription VOTA SUSCEPTA DECENNALIA, or VOTIS X. From the time of Antoninus Pius
Antoninus Pius
Antoninus Pius , also known as Antoninus, was Roman Emperor from 138 to 161. He was a member of the Nerva-Antonine dynasty and the Aurelii. He did not possess the sobriquet "Pius" until after his accession to the throne...

, we find these ceremonies marked on medals: PRIMI DECENNALES; SECVNDI DECENNALES; VOTA SOL. DECEN. II; VOTA SVSCEP. DECEN. III. These vows must have been made at the beginning of every tenth year, since on the medal of Pertinax
Pertinax
Pertinax , was Roman Emperor for three months in 193. He is known as the first emperor of the tumultuous Year of the Five Emperors. A high ranking military and Senatorial figure, he tried to restore discipline in the Praetorian Guards, whereupon they rebelled and killed him...

, who only reigned for 4 months in 193, there are the inscriptions VOTA DECENN. and VOTIS DECENNALIBVS.

Burkhard Gotthelf Struve (1671-1738), in his Antiquitatum romanarum syntagma cap. IV, is of the opinion that these vows took the place of those the censors used to make in the times of the Republic for the prosperity and preservation thereof. In effect, they were not only made for the ruler, but also for the state, as may be observed from Cassius Dio, and Pliny the Younger
Pliny the Younger
Gaius Plinius Caecilius Secundus, born Gaius Caecilius or Gaius Caecilius Cilo , better known as Pliny the Younger, was a lawyer, author, and magistrate of Ancient Rome. Pliny's uncle, Pliny the Elder, helped raise and educate him...

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