It is believed that a mosque was erected in memory of Sadhna Qasai (a saint). However, the authenticity of its existence is a mystery, as there is no recorded evidence of who has constructed this mosque. The recorded history of Sirhind mainly starts from the reign of Sultan Firoz Shah Tughlaq (1351-88). A fort was erected by the Sultan, but whether he had thought of constructing a memorial mosque as well is not clear. Looking at the style of its architecture, it looks like it belongs to a much later Mughal period.
Emperor Humayun’s (1530-40 & 55-56) last battle with Sikandar Sur, which led to the former’s restoration on the throne of Delhi, was fought at Sirhind in 1555. There is a possibility that Emperor Humayun might have commemorated his victory by constructing this mosque at Sirhind, just like his father Babur (1526-30) had done previously, by erecting a mosque named Kabuli Bagh in Panipat after his victory in the first battle of Panipat in 1526. But, in the autobiography of Emperor Humayun, as recorded by Gulbadan Bano Begum, no mention is made about this mosque. Also, I assume that while leaving for Persia after his defeat against Sher Shah Sur, Humayun may have paid homage at the grave of one of the oldest saints of Sirhind as he passed through. Promising, perhaps, that if he could recapture the throne of Delhi, he would definitely construct a mosque in honour of the saint. However, both the assumptions about this mosque are purely conjectural till some further evidence comes to light.
The mosque is made up of Sirhindi bricks. It currently has four domes with three chambers. Earlier, the mosque had one central large dome and four smaller domes measuring 2 x 2 on both sides of the central one. Unfortunately, the central main dome has collapsed. The four small domes are topped by a finial. The left chamber front finial has been tilted and broken, lying on the dome. The façade of the mosque rises to a height of 32.15 feet. The total area of the mosque is 37.0 x 18.8 sqm. The central chamber measures as 11.8 x 11.7 sqm. and the side ones, 14.1 x 6.0 sqm. each (Parihar, 2006)