The Ujjainiya (also spelled Ujjain and Ujjaini) are a Rajput clan that inhabits the state of Bihar.
The oral tradition of the Ujjaniya was written in the 19th century in a book called Tawarikh-i-Ujjaniya. According to this, they trace their ancestry to Ujjain where the Parmar Rajput kings ruled until their lands were over-run by tribal peoples. After settling in Bihar, the locals started to refer to them as Ujjainiya. They call themselves Ujjainiya Parmars.
History
The Ujjainiya Parmar Rajputs belonged to Ujjain in Malwa & migrated to Bihar ,got engaged in a war with the Jaunpur Sultanate .
The Ujjainiya Parmar Rajputs eventually became the rulers of the Bhojpur region in Bihar.
Under the leadership of Gajpat, the Ujjainiyas forged an alliance with Sher Shah Suri and together defeated the Bengal Sultanate. In the battle, Gajpat hand picked his own soldiers and along with Sher Shah Suri's army plundered the defeated Bengal army.
They ruled many Zamindari estates including Dumraon and Jagdispur in the Bhojpur region in Bihar.