Analysis of information sources in references of the Wikipedia article "इब्राहीम (उस्मानी साम्राज्य)" in Hindi language version.
Many of these ladies of the harem were non-Muslim, for example Sultana Kosem (Anastasia), of Greek origin, who was the wife of Ahmet I (1603-17), and the mother of Murat IV (1623-40), and of Ibrahim (1640-8)
