Jai Singh II of Amber vs Louis III of Hesse

Jai Singh II built the first Jantar Mantar observatory in Delhi, commissioned by Mughal Emperor Muhammad Shah. The observatory featured instruments like the Samrat Yantra and Jai Prakash Yantra for astronomical calculations. It was one of five observatories he built across India.

Jai Singh II founded the planned city of Jaipur, designed according to Vastu Shastra and Shilpa Shastra. The city was laid out in a grid pattern with wide streets and designated commercial zones. It became the capital of the Jaipur princely state.

Jai Singh II led a campaign against the Jat ruler Badan Singh of Javli. The battle resulted in Jai Singh's victory and the annexation of Javli territory into Jaipur. This expanded Jaipur's influence in the region.

Jai Singh II built the Jantar Mantar observatory in Jaipur, a collection of 19 astronomical instruments. The observatory allowed precise measurements of time, celestial positions, and eclipses. It remains one of the largest stone observatories in the world.

Jai Singh II compiled the Zij-i Muhammad Shahi, an astronomical table based on observations from his observatories. The work updated earlier Islamic astronomical tables and provided accurate data for celestial movements. It was presented to Mughal Emperor Muhammad Shah.

Louis III agreed to a series of liberal reforms, including the abolition of feudal privileges, freedom of the press, and the establishment of a more democratic parliament. These reforms were later partially reversed.

Louis III succeeded his father Louis II as Grand Duke of Hesse-Darmstadt during the 1848 revolutions. He was more pragmatic than his father and accepted some liberal reforms to stabilize his rule.

Louis III sided with Prussia during the Austro-Prussian War. After Prussia's victory, Hesse-Darmstadt was forced to cede some territories but was allowed to remain independent, unlike Hesse-Kassel.

Louis III led Hesse-Darmstadt into the newly formed German Empire under Prussian leadership. He became a constituent prince of the empire, losing much of his sovereignty but preserving his throne.