The Firdausi order was popular in the region of Bihar in India. The Firdausi order is a Sufi order that follows the teachings and practices of the Persian poet Firdausi. Here is a detailed explanation of why Bihar was the region where the Firdausi order was popular:

Historical Background:
- The Firdausi order traces its origins back to the 13th century in Persia, where it was established by the followers of the renowned poet Firdausi.
- Over time, the order spread to different parts of the Muslim world, including India.

Sufi Orders in India:
- Sufism is a mystical branch of Islam that emphasizes the inner path to spiritual realization.
- In India, various Sufi orders emerged, each with its own distinct practices and beliefs.
- These orders played a significant role in spreading Islam and its mystical aspects in the Indian subcontinent.

Popularity in Bihar:
- Bihar has a rich history of Sufi tradition and has been an important center for Sufi saints and their teachings.
- The region of Bihar witnessed the rise and influence of various Sufi orders, including the Firdausi order.
- The popularity of the Firdausi order in Bihar can be attributed to the presence of prominent Sufi saints who belonged to this order.

Prominent Sufi Saints in Bihar:
- One of the most revered Sufi saints in Bihar was Hazrat Shah Niamatullah Wali.
- Hazrat Shah Niamatullah Wali was a prominent Sufi saint who belonged to the Firdausi order.
- He played a significant role in spreading the teachings of the Firdausi order in Bihar.
- His mausoleum, located in the city of Bihar Sharif, is considered a sacred place by the followers of the Firdausi order.

Impact and Legacy:
- The Firdausi order, under the influence of saints like Hazrat Shah Niamatullah Wali, gained a wide following in Bihar.
- It played a crucial role in promoting Sufi ideas, fostering spiritual growth, and creating a sense of unity among its followers.
- The teachings of the Firdausi order continue to inspire and guide people in Bihar, keeping the Sufi tradition alive in the region.

In conclusion, the Firdausi order was popular in the region of Bihar in India due to the presence of influential Sufi saints, such as Hazrat Shah Niamatullah Wali, who belonged to this order. Their teachings and practices helped establish the Firdausi order as a significant Sufi tradition in Bihar, leaving a lasting impact on the spiritual and cultural fabric of the region.