Fakhruddin Mubarak Shah ruled an independent kingdom in areas that lie within modern-day eastern and southeastern Bengal

Bengal

Bengal is a historical and geographical region in the northeast region of the Indian Subcontinent at the apex of the Bay of Bengal. Today, it is mainly divided between the sovereign land of People's Republic of Bangladesh and the Indian state of West Bengal, although some regions of the previous...

. The kingdom's capital was Sonargaon

Sonargaon

Sonargaon is the ancient capital of Isa Khan's kingdom in Bengal. It is located near the current-day city of Narayanganj, Bangladesh....

. His conquests of the Comilla

Comilla District

The district of Comilla consists 4543 mosques, 379 temples, 98 churches, 34 Buddhist temples and six tombs.-Places of interest:Important landmarks include Kotbari, a cantonment, or military installation and Kandirpar, considered the heart of the Comilla district...

 and Noakhali

Noakhali District

Noakhali is a district in South-eastern Bangladesh. It is located in the Chittagong Division.-Geography:Noakhali District located in Chittagong Division, Bangladesh...

 were followed by territorial gains to the north (Sylhet

Sylhet District

The district of Sylhet consists 6754 mosques, 453 temples, 96 churches and four Buddhist temples.-Places of Interests:-Historical:#The Shrine of Hazrat Shah Jalal#The Shrine of Hazrat Shah Paran#Shahi Eidgah#Gour Govinda Fort#Kean Bridge...

) and south (Chittagong

Chittagong District

Chittagong District is a district located in the south-eastern region of Bangladesh. It is a part of the Chittagong Division. The port city of Chittagong, second largest city in Bangladesh, is located in this district.-History:...

). His military initiatives included a successful naval action against Sultan Alauddin Ali Shah

Alauddin Ali Shah

Alauddin Ali Shah was an independent ruler of Lakhnauti, the old capital of Bengal.-History:...

 of Lakhnauti

Gaur, West Bengal

Gour, or Gaur , as it is spelt mostly in modern times, or Lakhnauti is a ruined city, in the Malda district of West Bengal, India, on the west bank of the Ganges river, 40 kilometers downstream from Rajmahal.-History:...

.

Shah sponsored several construction projects, including a trunk road

Trunk road

A trunk road, trunk highway, or strategic road is a major road—usually connecting two or more cities, ports, airports, and other things.—which is the recommended route for long-distance and freight traffic...

 and raised embankments, along with mosque

Mosque

A mosque is a place of worship for followers of Islam. The word is likely to have entered the English language through French , from Portuguese , from Spanish , and from Berber , ultimately originating in — . The Arabic word masjid literally means a place of prostration...

s and tombs. Ibn Batuta, after visiting the capital in 1346, described Shah as "a distinguished sovereign who loved strangers, particularly the fakirs and sufis."