Sandoris, the natives of Sandor, are predominantly Roman Catholic Kshatriyas of the Christian Bombay East Indian community, they converted in the colony centred around Bassein, the richest possession of the former Portuguese East Indies with the capital at Velha Goa, in the southern edge of the Konkan region.

Prior to the arrival of Portuguese Armadas, there had also been some Nestorians descended from Jewish converts, by the efforts of the apostles Thomas or Bartholomew.

The natives of the Bassein (Vasai) are predominantly people whose culture derives from a composite of the Konkani substrate, overlaid by the Portuguese, Marathi& British rulers.

Following the conversions of 1564, a Portuguese noblewoman, Donna Irina, had a chapel, Our Lady of Help (Nossa Senhora da Ajuda) built in the village for the converts.

Pedro de Almeida, a Jesuit was appointed the 'Pai dos Cristaos' for 1574–1576, with charge of the Christians of Sandor and Papdy parishes.

The Mahratta Invasion of Bassein in 1739 did not destroy the chapel, although the Jesuits were forced to leave and it was thereafter served by the secular priests.

Sandor and the rest of the Vasai area were not disturbed by the intra-Catholic Padroado vs Propaganda Fide conflict, as the area remained firmly faithful to the Archbishop of Goa and refused to accept the authority of the Vicar Apostolic of Bombay and their successor, the Archbishop of Bombay.