Frei Xavier de Assunção was an Augustinian Vicar who worked in the Church of St John the Evangelist in Neura, Goa. The Church of St John the Evangelist at Neura was built in 1541.He was a native of Lisbon. He was born as Francisco Xavier de Oliveira in Lisbon in the parish of Nossa Senhora de Alecrim. He was the Prior of the convent of Daman. He was then the Vicar of Neura, Goa. He passed away in the convent of Graca de Goa.