Fr Antonio de S Guilherme was born as Antonio Dias. He was the son of Gaspar Dias and Inez Dias and was born in Lisbon in the Parish of Conceisao. He was Prior of the convet of Chaul in 1650. In 1651 he was elected Rector of the Colegio do Populo de Goa. He died in the convent of Grace de Goa on 16th October 1675.