Johann Christian Bach (September 5, 1735 – January 1, 1782) was the youngest of Johann Sebastian Bach's eleven sons and the eighth child of Johann Sebastian Bach. Bach went to London in 1762 after a period in Italy, earning the nickname "the London Bach." He was also known as John Bach throughout his stay in the British capital. He's credited for influencing Haydn's and Mozart's concerto styles. He made a significant contribution to the new sonata principle development. In 1760, he accepted the position of organist at Milan Cathedral. He switched from Lutheranism to Catholicism in Italy and spent most of his time writing religious music, including a Requiem Mass and a Te Deum. In 1757, he premiered a Mass, which was well received. Bach visited London in 1762 to premiere three operas, including Orione on February 19, 1763, at the King's Theatre. In his opera Adriano in Siria, the title character was created by castrato Giusto Fernando Tenducci, who became a personal friend in 1764 or 1765 at King's.