Cyrill Demian

Cyrill Demian (1772–1849) was an Austrian inventor of Armenian-Romanian origin, who made his living as an organ and piano maker with his two sons, Karl and Guido, in Vienna, Austria. Demian was born in Gherla, Transylvania, and died in Vienna. On May 6, 1829, Cyrill and his sons presented a new instrument to the authorities for patent - the accordion. The patent was officially granted on May 23, 1829.