Datar Kaur was betrothed to Ranjit Singh in childhood; the Anand Karaj took place when the couple were still young.

Though Ranjit Singh married several times for political reasons, Datar Kaur remained his favorite and most respected wife.

She took an active interest in the affairs of the State and was given command during the Battle of Multan (1818) alongside her son, Kharak Singh.

Her Samadhi is located in the royal garden, now part of the grounds of Government Islamia College, Civil Lines, Lahore.

[11] He was an ambitious man and had exceeded his rule to the taluqas of Bucheke, Chhanga Manga, 69km from Lahore, Chhichha, Devsal, Fatahpur, Jethupur, Kasur, Kharral fort of Kot Kamalia, Sharakpur, Gugera pargana, 5km to the west of the Ravi, and Shergarh.

[14] In an attempt to mislead her, Wazir Singh claimed that the Nakai Sandhu Jatts are superior to the Sukerchakias, but Karmo Kaur refused to break off the match and stated as Sikhs all were equal.

Though the nuptials of Datar Kaur and Ranjit Singh were arranged for political reasons, the two shared a close and loving relationship.

Her known physical and personal attributes describe her as being as beautiful and virtuous Goddess Rati,[21] along with being vivacious, independent, artistic, intelligent.

[26] Datar Kaur brought sweetness and light into Ranjit Singh's life and provided for him a focus of interest in his home.

[36][37] Her other descendants include- Late Lt Gen Jagdishwar Singh Nakai who joined the Indian army just when the Second World War broke out and served in the Burma Campaign.

[citation needed] Datar Kaur took interest in political affairs, and her husband sought her advised in important stately matters.

[39][40] Mai Nakain took control of the Sheikhupura Fort when her six-year-old son, Kharak Singh had conquered it.

But her daughter in law, Chand Kaur describes her as being as auspicious and beautiful as Goddess Lakshmi,[53] along with being vivacious, independent, artistic, intelligent and religious.

The ambitious Maharaja had been eyeing the Nakai territory, but had spared it till the death of Sardar Gyan Singh in 1807.

Diwan Hakim Rai, the administer of the Nakai Chief, immediately approached Ranjit Singh with the request that it was not proper for the Lahore forces to take military action against his nephew's misl.

Sohan Lai Suri notes that the Maharaja, very politely, said "I have nothing to do in this matter, Kunwar Kharak Singh is the maternal grandson of the Nakais and only he knows as to what is to be done."

Sohan Lal Suri in Umdat-ut-Tawarikh, writes that both the Maharaja and Maharani returned from a hunting trip to Sheikhupura and fell ill.

Ranjit Singh wanted the finest for his wife, hence the Royal Garden was chosen and the ashes of Mai Nakain were placed.