One of these people, Bagoas, was a favorite of both Darius III and Alexander.  
One group of these people was called the galli, and served as priests of Cybele. One of these people, Bagoas, was a favorite of both Darius III and Alexander.  An affair with Heloise led to Pierre Abelard's becoming one of these. Another, Wei Zhongxian ("way jong-syen"), suppressed the Donglin Academy and took de facto control of the Ming Dynasty. Another of these people commanded the Byzantine army alongside Belisarius, and was named Narses. Many of these men became so before puberty in order to sing in high registers. For 10 points, give this term for men who have been castrated.
One group of these people was called the galli, and served as priests of Cybele.
{eunuchs} [prompt on {castrati}]