Holy Roman Empress Maria Theresa of Austria I ordered a serenade from Mozart as a wedding present for my son Ferdinand. It brought down the house! Holy Roman Emperor Joseph II of Austria I most enjoyed Mozart's operas and attended many of his concerts before I became his patron. This young man is destined to rank among the immortals! Joseph Haydn Before God and as an honest man, I tell you that Mozart is the greatest composer known to me either in person or by name.