 However , no one had questioned Calvert 's conformity at the time , and if he had indeed been secretly Catholic , he had hidden it well . It seems more likely Calvert converted in late 1624 . At the time , Simon Stock , a <unk> <unk> priest reported to the Congregation Propaganda <unk> in Rome on November 15 that he had converted two Privy <unk> to Catholicism , one of whom historians are certain was Calvert . Calvert , who had probably met Stock at the Spanish embassy in London , later worked with the priest on a plan for a Catholic mission in his new first Newfoundland colony ( off modern Canada ) . 
