Ignacije Szentmartony (1718-1793) was a Croatian Jesuit born in Croatian north (Kotoriba in Medjimurje), of a Croat mother and Hungarian father. After his studies in Vienna and Graz he lectured mathematics in Graz. In 1751 he went to Lisabon, where he obtained the title of royal mathematician and astronomer, and as such was designated to be a member of expedition for determining borders. In 1753 he sailed off from Portugal to the mouth of Amazon river for geographic research there. Only a small amount of his work is preserved to these days: two maps of the Amazon and Rio Negro. By the end of his life, upon return to Croatia, he wrote the first Croatian kajkavian grammar for Germans: Einleitung zur kroatischen Sprachlehre für Teutschen, Varazdin 1783. For more information see [Zoric].