Born in Orbetello, Tuscany: 1750-1800 or 1805. Stage name of Giuseppe Merci, son of Luigi Merci, a village innkeeper in Tuscany. Aka 'Willedal de Merci'. A top-line stage pro in Italy (1796?), Germany (1780, 1796), France (1783-84, 1785), London (1784-85), Lisbon (1791), Poland and Russia (1789, etc). Died in Russia.
Possibly invented both Dancing Card (by 1784) and Jumping Plume (1784).
Coauthors: Philip Breslaw, Gustavus Katterfelto