Dentify the great classical composer known especially for his work with the symphony and a very long, successful patronage to the esterhazy family.

  Franz Joseph Haydn

Explanation:  Franz Joseph Haydn was an Austrian composer credited, among the others, for the development of chamber music. He is a representative of the Classical period, he has developed chamber music such as piano trio. In addition, he was known as the "father of the String Quartet" and "Father of the Symphony". He spent most of his musical career as a musician of the prestigious family Esterhazy on their property. He was one of Europe's most famous composers, a friend and mentor of Mozart, a tutor Beethoven, etc.

it further strained relations between the north and the south and convinced

i believe we're not a republic so that is a hard question