The Alka of Sinj is a unique knights' tournament that has been held continuously for more than three centuries in the town of Sinj. The knights' tournament is held to commemorate the year 1715, when the city of Sinj was defended from the much superior Ottoman army. Namely, as the defenders of Sinj had almost no chance of survival, according to the oral tradition of the people of Sinj at the time, the victory was achieved with the help of Lady of Sinj. It was thought that she had helped the endangered people in some way and her image was in the attacked fortress during the siege. Therefore, the defense was called miraculous, and in Sinj, shortly after the triumph, Alka started to be played in glory, in honor and in memory of the days of heroism. Alka of Sinj and the Miraculous Lady of Sinj have since formed an unbreakable bond in the identity and social life of the people of Sinj. Every year the local population magnificently celebrates the days of Alka and Lady of Sinj, but since the history of Sinj is full of stories, Alka itself as a living monument of intangible cultural heritage has not been spared the dark events of the past. Alka thus experienced many ups and downs, but in spite of everything it survived and still survives. During each change of government, the Alka Knights Society adapted Alka to the ideology of the new state administrators, and the reason for this was the necessary financial assistance that was needed and given by the ruling party in order to continue organizing the competition. In the Alka past, the greatest changes took place during the twentieth century, especially when Sinj was ruled by totalitarian systems. With the popularization of Alka of Sinj, many works about the knights' tournament were created, Alka is written about with enthusiasm or criticism, and the experiences of those who were participants are retold and recorded.