Franz Moritz Graf[1] von Lacy (English: Francis Maurice de Lacy, Russian: Boris Petrovich Lassi; October 21, 1725 – November 24, 1801), is the son of Count Peter von Lacy and is a famous Austrian field marshal.
He serves during the reign of Maria Theresa and is a close friend to Joseph II, Holy Roman Emperor, becoming one of the latter's advisers.