Mata Kaulaan was a daughter of Qazi named Rustam Khan. She was very wise and intellectual.
When she completed her elementary education, the Qazi got her admitted in the school of Sain Mian Mir for higher education.
She was very influenced by the holy personality of Sain Mian Mir and became her great devotee. He used to tell her about the Sikh Gurus and their hymns.
Sain Mian Mir used to recite hymns of Gurus in a very melodious voice. Mata Kaulaan liked the hymns and she also used to recite the sacred hymns in her house.
One day Qazi heard these hymns. He was fanatic Muslim, he considered the Sikh Gurus as infidels. So he warned her daughter not to sing such hymns.
Mata Kaulan requested Sain Mian Mir that she wanted to have a glimpse of the Guru Hargobind.
Once when the Guru had gone to meet Sain Mian Mir, Mata Kaulaan got the fortunate opportunity to see the divine face of the Guru.
She was so impressed that she considered herself the wealthiest woman of the world. She was so mesmerized that she could not utter a single word from her mouth.
Sain Mian Mir informed the Guru about the love of the girl for the Sikh faith. He also told the Guru that she sang the hymns of Guru Nanak in a very sweet voice.
The Guru blessed her and said, 'You are very fortunate, whoever sings the praises of God attains the Supreme bliss.'
One day Mata Kaulaan became so emotional that she began to sing the Divine Hymns in a loud voice. She forgot that Qazi was present in the house.
When Qazi heard her voice, he was so enraged that he took one stick and began to beat her ruthlessly and got a decree passed by Mohammdan priests.
Accrording to Muslim law ordained in Quraan, she was sentenced to death.
When her mother heard about it she sent her daughter in the school of Sain Mian Mir. She also told him about the death sentence.
Sain Mian Mir knew well that Mata Kaulan will be safe in the custody of Guru Hargobind. So he take her to Guru at Amritsar
He reached Amritsar and met Guru Hargobind and told him all about Kaulaan.
The Guru told him that Sain ji should not worry, she should be accommodated properly.
Next day the Guru allotted her a house near Harimandir sahib. He also made arrangement for her meals and clothes.
A lady attendant was recruited to help her and to give her company. There Kaulaan was free to recite the hymns of the Gurus according to her desire.
One day Mata Kaulaan asked her maid servant that she wanted to see the residence of the Guru. The maid servant agreed and she took her to Guru's Mahal.
There when she saw the lovely children of Guru Hargobind, she was very pleased to play with them she spent the whole day with them.
But when she returned to her house she became very sad. She was thinking again and again about the children of the Guru. A hidden desire germinated in her mind that she should also be a Mata of a child.
When one day Guru Hargobind went to see Mata Kaulaan he was astonished to perceive her sad face. When the Guru asked her the reason of sadness, she told him about her desire.
Hearing this, the Guru said, 'These children take birth and die, but we would give you an immortal son. He told her that on her name a Sarover would be constructed in front of her house. This Sarover would be known as Kaulsar.'
Hearing this, Mata Kaulaan felt very happy.