Amir-ul-Umara Mirza Raja Jai Singh I
27th Raja of Amber
Portrait of Raja Jai Singh I from a Mughal folio
Raja of Amber
Reign	13 December 1621 – 28 August 1667
Predecessor	Bhau Singh
Successor	Ram Singh I
Born	(1611-07-15)15 July 1611 Amber, Kingdom of Amber (present-day Rajasthan, India)
Died	28 August 1667(1667-08-28) (aged 56) Burhanpur, Khandesh subah, Mughal Empire (present-day Madhya Pradesh, India)
Spouse	Rathorji (Jodhawatji) Mrig Kanwarji d.of Sur Singh of Marwar Jadonji Anand Kanwarji d.of Raja Mukund Das of Karauli Chandrawatji Roop Kanwarji of Rampura Rathorji (Bikawatji) Har Kanwarji d.of Kunwar Kishan Singh and grand-daughter of Raja Rai Singh of Bikaner Chauhanji Raj Kanwarji
Issue	Ram Singh I Kirat Singh Hari Singh Vijay Singh Bal Singh
Father	Yuvraj Maha Singh[1]
Mother	Sisodiniji Damyanti Deiji d.of Kunwar Shakti Singh and grand-daughter of Maharana Udai Singh II of Mewar
Religion	Hinduism

Mirza Raja Jai Singh I (15 July 1611 – 28 August 1667) was the senior most general ("Mirza Raja") and a high ranking mansabdar at the imperial court of Mughal Empire as well as the Kachwaha Rajput ruler of the Kingdom of Amber (later called Jaipur). His predecessor was his grand uncle, Mirza Raja Bhau Singh, the younger son of Mirza Raja Man Singh I.

At the age of 10, Jai Singh I became the Raja of Amber and the head of the Kachwaha Rajputs. His military career spans the full reign of Shah Jahan and the first decade of Aurangzeb's reign. Jai Singh's military career began during the accession of Shah Jahan as the Mughal emperor in 1627. Taking advantage of the change in sovereigns, Jai Singh's commander in the Deccan, Khan Jahan Lodi, rebelled with his Afghan followers. However, Jai Singh brought away his own army to the north and then joined the campaign to defeat the rebels. Jai Singh was made a commander of 4000 for his service.

In 1636 Shah Jahan organized a grand campaign against the Deccan sultanates in which Jai Singh played a leading part—later this same army was sent to campaign against the Gond kingdoms. For his part in these successful ventures Jai Singh was promoted to the rank of commander of 5000 and the Chatsu district in Ajmer was added to his kingdom. By defeating the Meo robber tribes in the north of Amber, Jai Singh further increased the size of his ancestral kingdom. In 1641 he subdued the rebellion of Raja Jagat Singh Pathania of the hill-state of Mau-Paithan (Himachal Pradesh).

In 1638 the fort of Kandahar was surrendered by its Safavid Persian commander, Ali Mardan Khan, to Shah Jahan. The emperor's son Shah Shuja, accompanied by Jai Singh, was sent to take possession of the important fort. To overawe the Persian Shah from interfering in this task, Shah Jahan assembled a 50,000 strong army in Kabul. On this occasion Jai Singh received the unique title of Mirza Raja from Shah Jahan, which had earlier been given to his grandfather Raja Man Singh I of Amber by Emperor Akbar.

In 1647, Jai Singh joined in Shah Jahan's invasions of Balkh and Badakhshan in Central Asia.

In 1649, in another blow to Mughal prestige—Kandahar was recovered by Shah Abbas II. In the ensuing Mughal-Safavid War the Mughals twice attempted to eject the Persians from Kandahar under the command of Prince Aurangzeb (in 1649 and 1652) —on both occasions Jai Singh was present as an army commander, but the attempts failed due to the lack of adequate artillery and poor marksmanship of the Mughal gunners.

A third grand attempt was made in 1653 under the command of Shah Jahan's oldest and favorite son Dara Shikoh, a rival of Aurangzeb, and again Jai Singh was sent with this army. Dara Shikoh's campaign was marred by his military incompetence, including poor military advisors, and frequent clashes with officers who had taken part in the earlier campaigns under Aurangzeb. He repeatedly taunted Jai Singh for those failures. But when his own campaign ended with the same result, the Mughals finally gave up all attempts to recover Kandahar.

Dara Shikoh continued his hostility towards Jai Singh on their return to Agra. No promotions or awards were given to the veteran general for skillfully covering the army's retreat. Instead Jaswant Singh of the rival Rathor clan was made commander of 6000 and received the superlative title of Maharaja.

In 1657, Emperor Shah Jahan became incapacitated due to a serious illness. Dara Shikoh's three younger brothers made preparations to seize the throne. Shah Shuja in Bengal and Murad in Gujarat crowned themselves emperors, but Aurangzeb cleverly declared his intention of merely rescuing his father for the sake of Islam. In the face of these triple dangers, Dara Shikoh now remembered Jai Singh—and the Rajput chief was made commander of 6000 and sent east along with Dara's son Sulaiman Shikoh and the Afghan general Diler Khan

They triumphed over Shah Shuja at the Battle of Bahadurpur (24 February 1658)^[2] and chased him back to Bengal (May). By that time Aurangzeb had won the Battle of Dharmat (15 April 1658) and the Battle of Samugarh (29 May 1658) and captured Agra (8 June). Jai Singh and his men were stuck far in the east while their homes and families in the west were at the mercy of Aurangzeb's troops—so Jai Singh and Diler Khan advised Sulaiman Shikoh to flee while they submitted to the new emperor. Jai Singh then advised Maharaja Jaswant Singh against helping Dara Shikoh to secure his position with Aurangzeb.

Despite his victories Aurangzeb did not have a secure footing on the Mughal throne, still needing the support of the leading Muslim and Rajput generals. So he pardoned Maharaja Jaswant Singh who had fought him at Dharmat and promoted Jai Singh as a commander of 7000, the highest possible rank for any general.

The Deccan Wars between the Mughal Empire and the southern sultanates had been complicated by the rise of the Maratha king Shivaji. In 1659, Shivaji killed Afzal Khan, a notable general of Bijapur. In 1664, he sacked the wealthy port city of Surat. Raja Jai Singh, who had begun his own military career in the Deccan, was appointed to lead a 14,000 strong army against Deccan sultanates and the rising Marathas.^[3]

After winning several forts in Maharashtra from Shivaji, he besieged the Purandar Fort and forced Shivaji to sign the Treaty of Purandar in 1665. Jai Singh convinced Shivaji to come to terms and join him in an invasion of Bijapur which would be beneficial for both the Marathas and Mughals. According to Jadunath Sarkar, Jai Singh not only spared the prisoners of war but also gave rewards to those who fought bravely. For this triumph Jai Singh, already the highest ranking general, received rich gifts in gold and silver — both his sons, Ram Singh and Kirat Singh, were raised in rank. The latter was serving under his father, while the former was acting as his agent at the Mughal court.^[4]

The invasion of Bijapur Sultanate commenced in December 1665. Jai Singh now had an army of 40,000 to which Shivaji added 7,000 infantry and 2,000 cavalry. The Bijapuris melted away before this array and Jai Singh reached within 12 miles of Bijapur city. However, the scorched earth of the defenders exhausted Jai Singh's food supplies and forced him to begin his retreat in January 1666.^[5][6]

Aurangzeb held Jai Singh's son, Ram Singh I, responsible for Shivaji's escape, took away Ram Singh's estates, banished him from the court. Ram Singh was later pardoned and sent away to fight the Battle of Saraighat (1671) in faraway Assam. After the failed invasion of Bijapur by Jai singh he fell in to disfavour of Aurangzeb. He was replaced by Muazzam as viceroy of Deccan. He was recalled to royal court. On the way Jai Singh died in Burhanpur on 28 August 1667. The fortunes of his family sank low in the next two generations, but were revived later by Jai Singh II.

Aurangzeb erected the Chhatri (cenotaph) at the bank of Tapti River in Burhanpur in honour of Jai Singh I, now called "Raja Ki Chhatri".

• List of Rajputs

• Sarkar, Jadunath (1992). Shivāji and his times. Bombay: Orient Longman. ISBN 0-86125-609-3. OCLC 29616512.
• Sarkar, Jadunath; Simha, Raghubīra (1994) [1984]. A history of Jaipur: c. 1503-1938. Hyderabad: Orient Longman. ISBN 81-250-0333-9. OCLC 312542101.
• Haft Anjuman, correspondence of Mirza Raja Jai Singh compiled by his secretary Ugrasen.
• "Jaipur City (or Jainagar)". The Imperial Gazetteer of India. 1909. pp. 399–402.
• "Jaipur State". The Imperial Gazetteer of India. 1909. pp. 382–399.
• “A Mughal Icon Reconsidered,” Catherine Glynn and Ellen Smart. Artibus Asiae, Vol. LVII, 1/2, p. 5.