 Kösem's son, Sultan Ibrahim the Mad, Ottoman ruler from 1640 to 1648, is said to have drowned 280 concubines of his harem in the Bosphorus.At least one of his concubines, Turhan Sultan, a Rus' girl (from the area around modern Ukraine) who came into the Ottoman empire as a slave sold by Nogai slavers, survived his reign.In Istanbul, the separation of men's and women's quarters was never practiced among the poor, and by 1920s and 1930s it had become a thing of the past in middle and upper-class homes.