The Guardian Angel (1990)

An unspecified European country ca 1912 in the throws of political upheaval. A man only dressed in black (Jacob, played by Philip Zandén) is hired to assassinate the Interior Minister Joel Birkman (Etienne Glaser) after a particular brutal strike down of a student protest. He takes up work as the minister's bodyguard at his summer residence, and get's entangled in the affairs and politics of the Birkman family.