This rare romantic poetry by the sixth ‘Abbasid caliph, al-Amin (ruled 809–813), was written to his lover, Kawthar, not to one of his wives. Kawthar was not a woman, but a eunuch. The evolution of the phenomenon of the eunuch under the ‘Abbasids influenced almost all other dynasties that followed, from the medieval Fatimids, Turkmen and Ayyubids to the modern Ottomans and Qajars.

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El-Azhari, Taef. (2019). The Kingdom of Eunuchs under the ‘Abbasids. In Queens, Eunuchs and Concubines in Islamic History, 661–1257 (pp. 142-195). Edinburgh: Edinburgh University Press.

That's interesting.