Ranjit Singh's summer palace

The summer palace was a large palace in Amritsar owned by Maharaja Ranjit Singh of the Sikh Empire. It was used as his primary residence during the summer seasons, and was also occasionally used to throw feasts.

The palace was built atop old First Civilization ruins, in which Ranjit Singh kept the Koh-i-Noor, a Piece of Eden, safe from the hands of his enemies. During a feast thrown at the palace by the Maharaja in June 1839, the Koh-i-Noor was stolen by the Assassin Arbaaz Mir.

Later during the same feast, Singh was fatally poisoned by the British emmissary William Hay Macnaghten and Templar general Francis Cotton, the latter of which also destroyed the Koh-i-Noor during a fight with Arbaaz Mir in the palace courtyard.

Reference

 * Assassin's Creed: Brahman