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In page Sultanate of Rum:

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The Seljuk palaces, as well as their armies, were staffed with ghulams (plural ghilmân, Arabic: غِلْمَان‎), enslaved youths taken from non-Muslim communities, mainly Greeks from former Byzantine territories. The practice of keeping ghulams may have offered a model for the later devşirme during the time of the Ottoman Empire.[11]