Kaspar Foerster
Born: 28th February 1616, Gdańsk, Poland
Died: 2nd February 1673, Gdańsk, Poland
Nationality: German
Kaspar Förster (also Caspar Foerster) was a German singer and composer.
Förster studied music under his father Kaspar (1574-1652) and then under Marco Scacchi in Warsaw. He sang bass and conducted choirs at the Polish court in Warsaw from 1638 to about 1643, then served as kapellmeister to Frederik III of Denmark in Copenhagen between 1652 and 1655. In 1655, a war broke out between Denmark and Sweden, and Förster returned to Danzig, working as cantor at the Marienkirche there. He returned to the employ of Frederik from 1661 to 1667.
Read more at https://en.wikipedia.org/wiki/Kaspar_Förster