Wikipedia
Içoğlan
The term içoğlan refers to the boy servants who had been recruited according to the devşirme system in the Ottoman Empire, and who worked in the Enderûn, that is, Inner Palace, one of the three parts of Topkapı Palace in Istanbul. In other words, they were the Inner Palace servants, the staff serving in the head of state’s residence.
The same term was also used for certain members of the Janissaries.