Fr Matias do Rosario was a native of Lisbon, Portugal. He was born Marias da Silva in the Parish of Santa Ana in Lisbon, Portugal. He was procurator of the convent of Grasa ( Grace) de Goa on 11th November 1630. He was also rector of the seminary of Sao Guilherme de Goa in 1702. He was also Prior of the Convent of Chaul in 1702.