İstanbulspor is a Turkish football and sports club founded by Istanbul High School students in 1926. In 2004–05 they were relegated from the Turkish Süper Lig (Super League) to TFF 1. Lig. For many decades it was the fourth most famous and well-developed professional football club from Istanbul, coming after Beşiktaş, Galatasaray, and Fenerbahçe. After being bought by the Uzan Family in 1990, it has been repossessed by the government and resold to third companies. Their greatest success is the Turkish championship title won in 1932.