Manuel da Assumpção (then spelled Manoel da Assumpçam) was a Portuguese missionary who wrote the first grammar of the Bengali language, in 1743, titled "Vocabulario em idioma Bengalla, e Portuguez" (Vocabulary of Bengali language and Portuguese.
Divided into two parts) (archaic Portuguese: Vocabulario em idioma Bengalla, e Portuguez.
Assumpção wrote this first grammatical instructions of the Bengali language between 1734 and 1742 while in Bhawal estate, now in Bangladesh.
[1] Manuel da Assumpção wrote another book under the title “Crepar Xastrer Orth, Bhed” (কৃপার শাস্ত্রের অর্থ-ভেদ).
It was a bilingual book Crepar Xastrer Orth, Bhed, / Cathecismo da Doutrina Christãa (Bengali / Portuguese) written in 1735 in Bhawal estate in Bengal, now Bangladesh and published in Lisbon in 1743.