It's a Bengali-language book, called "Itihashey Upekkhito" (neglected in history), by Professor Tarapada Mukherji, and published by Ananda Publishers Private Limited, Calcutta, in 1984. It portrays the life and work of Dom Antonio, son of the king of Busna (Bhushona, now in Bangladesh). Portuguese missionaries in the 18th century converted him to Christianity and let him preach Christianity later. Dom Antonio's Bengali-language manuscript "Brahman-Roman Catholic Sangbad" is considered to have blazed a new era of prose literature in Bengali language.