Daulatabad was constructed by Muhammad bin Tughlaq, who was the Sultan of Delhi from 1325 to 1351. He was the third ruler of the Tughlaq dynasty and is known for his ambitious and often controversial policies.

Background:
Daulatabad, also known as Devagiri, is located in present-day Maharashtra, India. It played an important role in the medieval history of India, serving as the capital for various dynasties. The construction of Daulatabad was part of Muhammad bin Tughlaq's plan to shift the capital of the Delhi Sultanate from Delhi to a more strategic location.

Reasons for Construction:
1. Strategic Location: Daulatabad was situated on a hilltop, which provided a natural defense against enemy attacks. The location also offered a commanding view of the surrounding area, making it easier to monitor and control the region.

2. Water Supply: The area had a natural water source, which was crucial for sustaining a large population. The presence of the Bori River near the hill made it easier to ensure a constant water supply for the city.

3. Economic Potential: Daulatabad was surrounded by fertile lands and had access to trade routes, making it a suitable location for economic activities. Muhammad bin Tughlaq envisioned the city as a major commercial hub, attracting merchants and traders from different parts of the empire.

4. Administrative Efficiency: The construction of Daulatabad was also motivated by the Sultan's desire to establish a more efficient administrative system. He believed that a centrally located capital would help him better govern his vast empire and maintain control over distant provinces.

Features of Daulatabad:
1. Fortifications: The city was heavily fortified with strong walls, bastions, and moats. The fortifications were designed to withstand enemy attacks and provide a secure environment for the residents.

2. Citadel: At the center of Daulatabad, there was a citadel known as the Qila-i-Rozah or the Citadel of Victory. It served as the residence of the ruling Sultan and housed important administrative buildings.

3. Water Management: To address the water needs of the city, Muhammad bin Tughlaq commissioned the construction of an elaborate water system. This included reservoirs, tanks, and wells to ensure a steady supply of water for the residents.

4. Architecture: The architecture of Daulatabad reflects the influence of both Hindu and Islamic styles. The city had mosques, palaces, and other structures that showcased the artistic and architectural achievements of the time.

Conclusion:
Daulatabad, constructed by Muhammad bin Tughlaq, was a strategically located city with strong fortifications, a well-planned water management system, and an architectural blend of Hindu and Islamic styles. Although the plan to shift the capital did not succeed in the long run, Daulatabad remains an important historical site in India.