Anton Haizinger heard Haizinger sing in concerts, and offered him an engagement at the theatre; Haizinger gave up teaching. Haizinger's first roles at Theater an der Wien, in 1821, were in two operas by Rossini, as Gianetto in "La gazza ladra" and Lindoro in "L'italiana in Algeri". He soon became well-known in Vienna. The role of Adolar in Weber's opera "Euryanthe", premiered in 1823 at the Theater am Kärntnertor, was created for him, and he was a soloist in the premiere in 1824 of Beethoven's Ninth Symphony at the same theatre. He continued studies with Antonio Salieri. At this time, Italian opera
Beatrice Regina della Scala time she had a political request to Bernabò. Beatrice Regina died on 18 June 1384 at the age of fifty-three years. She was buried in Milan. A year and a half later, her husband was deposed and later poisoned by his nephew and son-in-law Gian Galeazzo Visconti, who in 1395 became the first Duke of Milan. She gave her name to the church of Santa Maria alla Scala in Milan, and by extension, the La Scala opera house ("Teatro alla Scala") which was built on the same site four hundred years later. Together Bernabò and Beatrice Regina had seventeen children: