Answer:
Castrano
Explanation:
According to my research on Opera terminology, I can say that based on the information provided within the question these roles were sung by a singer known as a Castrano. This is a classical male singing voice equivalent to that of a soprano, mezzo-soprano, or contralto, in the time period where Opera was popularized this type of singing voice was achieved by castrating the male singer right before they hit puberty.
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