This study aims to examine the role of the Deli Sultanate in the development of Islam in Medan City, particularly through the existence of Maimun Palace as a symbol of power and a center of religious activities. The research employed a qualitative method with a descriptive approach. Data were collected through direct observation at Maimun Palace, in-depth interviews with a key informant, and documentation. The results show that Maimun Palace had strategic functions as a center of government, the residence of the sultan, and a place for cultural and religious activities. In addition, the palace’s magnificent architecture reflects the glory of the Deli Sultanate by integrating Malay, Islamic, and European elements. The study also finds that the Deli Sultanate was not the first Islamic kingdom in North Sumatra, but rather part of a continued Islamization process following earlier Islamic kingdoms such as the Aceh Sultanate. The founder of the Deli Sultanate was Tuanku Panglima Gocah Pahlawan, while Maimun Palace was built by Sultan Ma’mun Al Rasyid Perkasa Alamsyah between 1888 and 1891. Overall, the Deli Sultanate played a significant role in strengthening and developing Islam in Medan through the integration of religious values into governance, culture, and social life.
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