Dadivank Monastery is a significant Armenian Apostolic monastery complex situated in the Kalbajar District of Azerbaijan. The monastery's foundation is traditionally associated with St. Dadi, a disciple of the Apostle Thaddeus, who preached Christianity in the region during the 1st century AD. The earliest surviving structures, however, date from the 9th century, with the main Cathedral of the Mother of God being constructed between 1211 and 1234 under the patronage of Prince Vakhtang of Haterk and his wife Arzu-Khatun. This period marked a major expansion and flourishing of the complex. Throughout the medieval era, Dadivank served as a prominent religious, cultural, and educational center. The monastery complex includes several churches, chapels, a bell tower, and numerous khachkars, which are intricately carved cross-stones. The interior of the main cathedral features important frescoes from the 13th century, depicting biblical scenes and the patrons of the church. Following the First Nagorno-Karabakh War, the monastery came under the control of the breakaway Republic of Artsakh and underwent significant restoration work. After the 2020 war, the area, including the monastery, returned to the control of Azerbaijan. The site is recognized for its historical and architectural value and is a notable destination for those interested in medieval Christian architecture and Caucasian history.