I research how eunuchs (castrated men) are portrayed in literature. I’ve written the following articles to discuss the referenced religious and mythological figures.
Attis, described in Hermaphrodeities by Raven Kaldera (2001)
Serapis, an Egyptian god modeled after Osiris
The Ethiopian Eunuch, baptized by the Apostle Philip near Jerusalem (Christian; as described in the Book of Acts)