 This was a great honor, as only a handful of singers had multiple operatic roles written expressly for them by Mozart.Cavos and Camilla's eldest son, Albert Catterinovich ""Alberto"" Cavos (1800-1863), was an architect best known for his theatre designs, having built Russia's two most iconic theatres, the Mariinsky Theatre in St. Petersburg (1859–1860) and the Bolshoi Theatre in Moscow (1853–1856).Albert's daughter Camilla married Nicholas Benois, a prominent Russian architect, and became the matriarch of the Benois family.