Brahmin sect in Uttar Pradesh, India
Saryuparin Brahmin, also known as Saryupareen Brahmin, or Saryupari Brahmin, is a subcaste of the Kanyakubja Brahmin, native to the eastern plain of the Sarayu river in Eastern Uttar Pradesh, India. 
Origin.
According to one legend, the Brahmins did not want to accept food prepared in the "Ashvamedha yajna" performed by Rama, because the latter committed "brahmahatya" by killing Ravana, a Brahman. As a solution, Hanuman brought sixteen Kanyakubja Brahmin boys, who underwent thread ceremony in Ayodhya. They were fed and were offered charities, after which they were taken back to Kanyakubja by Hanuman, where their parents refused to accept them. Therefore they had to settle on the bank of the river Sarayu.
According to another legend, the Brahmin brought from Kanyakubja were adults and experts in ritualistic performances. Among them, Brahmins of Garga, Gautam and Shandilya gotras were appointed as Udgata, Aghwarya and Brahma, respectively. Therefore, these Gotras are considered most prominent among Saryupareens.
References.
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