Kariyan is a village in the c.d.block of Shivaji Nagar in the Samastipur district of Bihar.
About 16 km northeast of the Rosera ghat railway station of the Northeastern Railway the modern village of Karian is situated on a mound, 20-ft high from the surrounding ground level and about 96 acres in area. Local traditions associate this village to be the birthplace of Udayanacharya, a Maithil Brahmin and great philosopher of ancient times who is also supposed to be an incarnation of Lord Vishnu. Extensive excavations have revealed at this village antiques of as back as of 2nd century BC and afterwards from 6th century AD to post 1200 AD. This village is the birthplace of philosopher and scholar Udayana alias Udayanacharya.
Kariyan is the land of The Great Vaishnav Saint, incarnation of Lord Vishnu's Sudarshan. He dominated Shakti and Shaiv in Mithila by Shastrarth. He published The Vaishnav (Sri Sampraday) in Mithla. In the age of 46. He went To Parampad Dham Of Lord Vishnu.