Isis was a very popular deity in Pompeii, but she wasn’t from Italy originally. Isis was the queen of the Egyptian gods, and the idea of her as rituals honouring her would have been brought to Pompeii from overseas. Egyptian influence was strong in Pompeii – you may remember the Egyptian elements in the frescoes of the House of the Fruit Orchard – because of the trade routes between the great Egyptian city of Alexandria and the Bay of Naples.
In Egyptian mythology Osiris (king of the gods) had been torn to pieces by his jealous brother Set. Isis used her healing magic to revive Osiris. This myth was connected to the idea that Isis could offer her worshippers eternal life after their deaths.
The worship of Isis was a mystery cult, which means that all worshippers had to undergo a rite of initiation. Not everyone would choose to do this, and the rituals worshipping Isis had to be kept secret from non-initiates. The cult was open to men, and had professional male priests, but evidence suggests that about a third of worshippers were women. Julia Felix, whose house we looked at for its forum fresco in Topic 1, was probably a worshipper of Isis as her house contains shrines, paintings and statuettes dedicated to the goddess.
The temple of Isis in Pompeii held two daily services, and it appears to have been open all day unlike other temples. The frescoes from the temples in Pompeii and Herculaneum show the ceremonies in detail and give us good evidence about how people worshipped Isis. We can see in the pictures people waving sistra (singular sistrum), an item a bit like a tambourine, during their worship. Archaeologists have found real examples of these. There were two major festivals to Isis:
• The Navigation of Isis – where a procession carried a small boat to the seashore and prayed for the protection of sailors
• The Isia – the commemoration of the discovery of Osiris' body, it is believed this is when initiations took place
There is evidence to suggest that many Romans, including the Emperors, did not like the worship of Isis. Apparently they thought that this foreign cult was a threat to Roman values. It seems to have remained a very important cult in Pompeii however. The Temple of Isis in Pompeii was badly damaged by an earthquake. An inscription found above the entrance tells us it was rebuilt with money donated by Numerius Popidius Celsinus. In thanks, he was made a member of the town council, despite the fact that he was only 6 years old at the time!