The Alka of Sinj is a unique knights’ tournament that has been held in the town of Sinj for centuries. The tournament has been played to commemorate the year 1715 when the people of Sinj defended the town against the much superior Ottoman army. In the Alka tournament the knights on the horseback with a spear in the hand at a full gallop aim at the center of the alka ring hanging above the racecourse. The locals celebrate the tournament as a national holiday. The importance of Alka lies in its more than three hundred years old tradition. In the history the town of Sinj had been under several different rulers which meant that the tournament had to adapt to newly formed governments. The organization of the tournament required relevant financial help given by the state authorities. That is why Alka Knights Society had to be in good relations with the governments in order to maintain its existence. Despite political and economic crisis the people of Sinj have managed to preserve the traditional tournament due to their deep devotion and respect for their heritage. There are many documents witnessing the history of Alka, but many of them are lost so the complete story of Alka is still to be revealed.