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The Battle of Kleidion (or Clidium, after the medieval name of the village of Klyuch, "(the) key"; also known as the Battle of Belasitsa) took place on July 29, 1014 between the Bulgarian Empire and the Byzantine Empire.
Montenegro's culture has drawn influences mainly from Ancient Greece, Ancient Rome, Christianity, Islam, Byzantine Empire, Bulgarian Empire, Serbian Empire, Ottoman Empire, Republic of Venice, Austria-Hungary, Kingdom of Italy, and Yugoslavia.
In order to commemorate the battle, the Bulgarian emperor had an inscription carved in one of the marble columns of the Church "Holy Forty Martyrs" in the capital of the Bulgarian empire Great Tarnovo.
Some of the Bulgarian Empire's most significant historical records are stored in the church, including Omurtag's Column, Asen's Column and the Border Column from Rodosto from the rule of Khan Krum.
Simeon I of Bulgaria, ruled over the First Bulgarian Empire 893–927