[1][2] It was the capital region of two of the three dynasties of Kamarupa and Guwahati, the current political center of Assam, is situated here.

Raghudev's kingdom came to be called Koch Hajo in Muslim chronicles, and Kamrup in Ekasarana documents.

[17] As the Mughal established the rule of the Bengal Subah in Dhaka, Koch Bihar entered into an alliance with them against Parikshitnarayana, the son and successor of Raghudev.

Though the Mughals pushed further east they came into direct military conflict with the Ahom kingdom and finally settled the boundary at Barnadi river following the Treaty of Asurar Ali in 1639.

[20] The sixth faujdar, Lutfullah Shirazi, built a hilltop mosque in Koch Hajo in 1657.

The mosque contained the mazar (mausoleum) of Prince Ghiyath ad-Din Awliya of Iraq, who is commonly credited for introducing Islam to the region.

Incomplete list of Faujdars of Guahati: After the Battle of Itakhuli (1682), the Ahom kingdom established control over Sarkar Kamrup, and it became the domain of the Borphukan, based in Guwahati.

The region continued to be called Kamrup and its eastern and western boundaries were identical to the later British district.