On 8 October 1839 the new emperor Kharak Singh, was overthrown in a coup by his prime minister Dhian Singh. The prime minister's brother Gulab Singh, Raja of Jammu, came into possession of the Koh-i-Noor. Kharak Singh later died in prison, soon followed by the mysterious death of his son and successor Nau Nihal Singh on 5 November 1840. Gulab Singh held onto the stone until January 1841, when he presented it to emperor Sher Singh in order to win his favour, after his brother Dhian Singh negotiated a ceasefire between Sher Singh and the overthrown empress Chand Kaur. Gulab Singh had attempted to defend the widowed empress at her fort in Lahore, during two days of conflict and shelling by Sher Singh and his troops. Despite handing over the Koh-i-noor, Gulab Singh as a result of the ceasefire returned safely to Jammu with a wealth of gold and other jewels taken from the treasury.