 In the first period of its existence, from early 13th to about early 15th century (1415), the fortress was built in the Romanesque architecture style.Throughout its turbulent history, this magnificent object has been burned and ransacked at least 18 times as per official records.Of note is that Doboj fortress was considered to be a royal Kotromanic property, unlike Great Bosnian Duke Hrvoje's Zvecaj fortress or Sandalj Hranic's Blagaj fortress, which were centers of their respective dukedoms.