In the middle of the 15th century, a Muslim colony was founded in the mangrove forest of the Sundarbans, near the coast in the Bagerhat District by a saint-General, named Khan Jahan Ali. He preached in an affluent city during the reign of Sultan Nasiruddin Mahmud Shah, then known as 'Khalifatabad'.[1] Khan Jahan adorned this city with more than a dozen mosques, the ruins of which are focused around the most imposing and largest multi-domed mosques in Bangladesh, known as the Shait-Gumbad Masjid (160'×108').[1] The construction of the mosque began in 1442[1] and was completed in 1459. The mosque was used for prayers as well as a madrasha and assembly hall.