The game spread to South Asia where it has had a strong presence in the north western areas of present-day Pakistan (including Gilgit, Chitral, Hunza and Baltistan) since at least the 15th–16th century.[17] The name polo is said to have been derived from the Balti word "pulu", meaning ball.[18] Qutubuddin Aibak, the Turkic slave from Central Asia who later became the Sultan of Delhi in Northern India from 1206 to 1210, suffered an accidental death during a game of polo when his horse fell and he was impaled on the pommel of his saddle.