During this time Wolfgang also wrote a new opera, Mitridate, re di Ponto for the court of Milan. Other commissions followed and in subsequent trips to Italy, Wolfgang wrote two other operas, Ascanio in Alba (1771) and Lucio Silla (1772).
Wolfgang Amadeus Mozart and his father returned from their last stay in Italy in March, 1773. His father's benefactor, Archbishop von Schrattenbach had died and was succeeded by Hieronymus von Colleredo. Upon their return, the new archbishop appointed young Mozart as assistant concertmaster with a small salary. During this time, young Mozart had the opportunity to work in several different musical genres composing symphonies, string quartets, sonatas and serenades and a few operas. He developed a passion for violin concertos producing what came to be the only five he wrote. In 1776, he turned his efforts toward piano concertos, culminating in the Piano Concerto Number 9 in E flat major in early 1777. Wolfgang had just turned 21.
Despite his success with the compositions, Wolfgang Amadeus Mozart was growing discontent with his position as assistant concert master and the confining environment of Salzburg. He was ambitious and believed he could do more somewhere else. Archbishop von Colloredo was becoming inpatient with the young genius's complaining and immature attitude. In August 1777, Mozart set out on a trip to find more prosperous employment. The archbishop wouldn't give Leopold permission to travel, so Anna Maria accompanied Wolfgang on his quest to the cities of Mannheim, Paris and Munich. There were several employment positions that initially proved promising, but all eventually fell through. He began to run out of funds and had to pawn several valuable personal items to pay traveling and living expenses. The lowest point of the trip was when his mother fell ill and died on July 3, 1778. After hearing the news of his wife's death, Leopold negotiated a better post for his son as court organist in Salzburg and Wolfgang returned soon after.