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Jaisingh Siddharaja (1094–1143 AD), the son of Chalukya King Karna of Gujarat and Maynalladevi, was the best emperor of that dynasty. He was born in 1094 AD. He was a minor at the time of his father's death, so his mother, Maynalladevi, ruled as guardian for many years. Emperor Siddharaj is also called "Barbaric Jishnu" because he conquered Babra Bhil.
After coming of age and assuming the kingship, Jai Singh turned his attention towards conquering the neighboring kingdoms. After several battles, he was able to defeat Navaghan, or Khangar, the Chudasama Rajput ruler of Saurashtra. He appointed an officer named Sajjan as Prantpal for the administration of the conquered region, but probably Jai Singh's power could not be permanent.
Jayasimha forced Asharaja of the Chahamana dynasty of Nadol, an old enemy of the Chalukyas, to accept submission and rule as a vassal. He also attacked the Chahamana kingdom of Shakambhari in the north and captured its capital. But like a skilled strategist, he married his daughter to the Chahamana king Arnoraj to strengthen his side and allowed Arnoraj to rule as a feudatory.
A tale claims that Arnoraja vanquished the Gujarati Chalukya king Siddharaja Jai Singh and wedded his daughter Kanchana Devi. He was the head of Shakambhari's Chauhan dynasty. Other names for him included Nal, Aveladev, Anak, etc. Arnoraj constructed Pushkar's renowned Varahmandir. In 1137 AD, Anasagar Lake was constructed. Jagaddev, the eldest son of Arnoraj, killed his father after being influenced by the power of Hemchandra Suri. He himself sat on the throne as the king. But Arnoraj's second son, Vigraharaj, defeated Jagaddev. And the whole kingdom of Samadalaksha was included in the authority of Vigraharaja. Vigraharaja also retaliated against his father's insult. Famous scholars Debbodh and Dharmaghosa were in the court of Arnoraja.
He had received help from Asharaja and Arnoraja against Paramara King Naravarman of Malava. After a long war, Narvarman was imprisoned, but Jaisingh later freed him. Narvarman's son, Yashovarman, also continued the war. In the end, the victory was still Jai Singh's. The captive Yashovarman had to remain in prison for some time. On the occasion of this victory, Jaisingh took the oath against Avantinath and appointed Mahadev to rule Avantimandal. But in the last years of Jayasimha's reign, Yashovarman's son Jayavarman made some parts of Malwa state independent.
Siddhraj Jaysinh had freed some part of his kingdom from the Parmar dynasty of Someshwar of Bhinmal. Jaisingh helped Someshwar of the Paramara dynasty of Bhinmal recover his kingdom and probably invaded eastern Punjab with him. Jaisingh could not achieve any remarkable success against Chandela King Madanavarman. Probably apprehensive of the successes of Madanavarman in Malava, he made friendly relations with the Kalachuris and the Gahadavalas of Tripuri.
The Western Chalukya dynasty of Kalyana's Vikramaditya VI records multiple conquests of the Lats and Gurjaras north of the Narmada. However, it appears that the Chalukya empire was unaffected by them and must have been simply a transient mission. In one of his inscriptions, Jayasimha describes defeating Permardi, however it's more likely that the defeated king was an average one rather than the well-known Chalukya ruler. The victory over Sindhuraja, who might have been a local Muslim vassal of Sindh, is also attributed to Jayasimha. Barbarak, who was probably a member of a non-Aryan caste who lived in Gujarat and troubled the sages of Siddhpur, was likewise vanquished by Jaisingh.
Jaisingh expanded the frontiers of the Chalukya Empire, which no other king of that dynasty could have done because of his successes. His jurisdiction included Bhilsa in the west, Jodhpur and Jaipur in the north. He also included Kathiawar and Kutch in his Dynasty.
Jaisingh lacked a son. The final years of his life were depressing as a result. Following his passing, Kumarpal, the great-grandson of his paternal grandpa, Kshemraj, assumed the crown. However, because Kshemraj was not Aura's child, Jaisingh adopted Bahad, the child of his minister Udayan.
Jaisingh is more memorable because of his cultural acts than his victories. Jaisingh established Gujarat as a center of education and literature by patronizing poets and scholars. The names of Ramchandra, Acharya Jaymangal, Yashchandra, and Vardhaman are noteworthy in these poems. He gave the title of Kavindra to Shripal and called him his brother. However, Jain Pandit Hemchandra was the most illustrious and well-known of them, as well as Jai Singh's personal favorite and object of his adoration. His versatility diminished the significance of other modern scholars. Through the publication of his grammar book, Siddhahemchandra, he immortalized the name Siddharaj.
Jaisingh was a follower of Shaivism. According to Merutung, on the orders of his mother, he abolished the tax collected from travelers in Bahulod. But in religious matters, his policy was liberal and equanimous. Most of his contemporary scholars were Jains. But in patronizing the Jains, he had no partiality towards them. He once enquired about religion and God with teachers from many schools, but ultimately, influenced by Hemchandra, he came to believe that the road of virtue was the finest. He also had a liberal stance on Islam.

His most significant achievement was the Rudramahalaya Temple in Siddhapur, which is renowned for its intricate design among Indian temples. He also constructed a Kirtistambh close by and the Sahasralinga lake. On the banks of the Saraswati, he also constructed a Dashavatar Narayan shrine.
Jayasimha got the title of Siddharaja. At that time the Chalukya dynasty was also called the Solanki dynasty, hence Jayasimha's full name was Jaisingh Siddharaj Solanki.