Introduction:
The capital of Malwa was the ancient Hindu city of Dhar. However, it was later shifted to Mandu by a ruler. The ruler who made this shift was Hoshang.

Explanation:
- Hoshang: Hoshang was a ruler of Malwa who reigned during the 10th century CE. He was a member of the Paramara dynasty which ruled over Malwa during that time. Hoshang is known for his contribution to the development of Mandu, which eventually became the capital of Malwa.

- Shift to Mandu: Hoshang decided to shift the capital from Dhar to Mandu due to several factors. Mandu was strategically located on a plateau, surrounded by natural defenses such as hills and deep ravines. This made it an ideal location for a capital city, as it provided protection against external invasions.

- Strategic Location: The location of Mandu also provided easy access to important trade routes, making it a hub for commercial activities. This helped in the economic development of the region and contributed to the prosperity of the kingdom.

- Architectural Development: Hoshang was also known for his patronage of art and architecture. He commissioned the construction of several magnificent structures in Mandu, including palaces, temples, and mosques. The most famous among them is the Hoshang Shah's Tomb, which is considered to be one of the earliest marble structures in India.

- Cultural Influence: Hoshang's patronage of art and architecture attracted many artists and scholars to Mandu. This led to a flourishing of culture and learning in the region, making it a center for art, literature, and music.

- Legacy: Hoshang's decision to shift the capital to Mandu had a lasting impact on the region. Mandu continued to be an important political and cultural center even after the decline of the Paramara dynasty. Its architectural marvels and rich cultural heritage have made it a popular tourist destination in present times.

Conclusion:
Hoshang, a ruler of Malwa, shifted the capital from Dhar to Mandu. This decision was driven by the strategic location of Mandu, its natural defenses, and its potential for economic and cultural development. Hoshang's patronage of art and architecture further contributed to the growth and prosperity of Mandu. Today, Mandu stands as a testament to its glorious past and is a reflection of the vision of its ruler.