The Curse of Turan (Hungarian: Turáni átok) is a popular belief that Hungarians have been under the influence of a malicious spell for many centuries. The "curse" manifests itself as inner strife, pessimism, misfortune and several historic catastrophes. The first disaster was the invasion by the Mongols, and the second the invasion by the Ottomans, Battle of Mohács in 1526.
I heard about this from a Hungarian friend. There is also an expression in Hungary: 'What are the 4 worst things you can face: the Death, no house, no food and a Turk'. But never could verify this expression...
