About The Galli
The first Galli arrived in Rome when the Senate officially adopted Cybele as a state goddess in 204 BC. Roman citizens were prohibited from becoming Galli, which meant that they were all orientals or slaves. Under Claudius, this ban was lifted. Eventually Domitian reaffirmed that Roman citizens were forbidden to practice eviratio (castration).
The Galli castrated themselves during an ecstatic celebration called the Dies sanguinis, or "Day of Blood", which took place on March 24. At the same time they put on women's costume, mostly yellow in colour, and a sort of turban, together with pendants and ear-rings. They also wore their hair long, and bleached, and wore heavy make-up. They wandered around with followers, begging for charity, in return for which they were prepared to tell fortunes. On the day of mourning for Attis they ran around wildly and dishevelled. They performed dances to the music of pipes and tambourines, and, in an ecstasy, flogged themselves until they bled.
Read more about this topic: Galli