Between the 16th and the 18th centuries, Middle Bengali became a major idiom of literary expression in the kingdom of Arakan. It is within the domain of this coastal kingdom, which then comprised the region of Chittagong in today’s Bangladesh, that Muslim subjects of the Buddhist kings started using the courtly vernacular that was previously cultivated by Hindu dignitaries of the Ḥusayn Shāhī sultans of Bengal. By the mid-17th century, which constituted a moment of economic prosperity and maximum territorial expansion, all genres of Middle Bengali poetry were represented in the corpus of texts written by authors living in the urban and rural areas of the kingdom. The many treatises on Muslim beliefs and meditative practices, the hagiographic literature, and the courtly romances testify to the formation of a local Islamic cultural ethos. After the Mughal conquest of Chittagong in 1666, local literacy was still cultivating standards set by authors of the Arakanese period such as Saiẏad Sultān and Ālāol. In Arakan itself, Bengali Muslim literature continued to be produced and transmitted until at least the first half of the twentieth century. A large number of manuscripts was collected in the first decades of the twentieth century and these are preserved in various institutions in Bangladesh. The Bengali literature of Arakan is characterized by its Indic religious idiom and Sanskritized poetics, but also by its complex intertextuality that reflects the region’s connections with north India and the Persianate trading networks of the Bay of Bengal. Up to the 2000s, the Bengali literature of Arakan has mostly been discussed within the framework of the national literary history of Bangladesh, but subsequently scholars have relocated this corpus within the cultural domain of the Bay of Bengal and the Islamicate literary traditions of South and Southeast Asia.