Christoph Gluck (1714-1787) was born in Germany, educated in Prague, and then settled in Vienna in 1736. Whilst categorized as a baroque composer, he was born in a year halfway between Bach's and Haydn's years of birth, and so there are signs of a more classical style emerging in his operas. He spent a couple of years in London, where he became a great friend of Handel.
Gluck is primarily known for his operas Orpheus and Euridice, Alceste, and Iphigenie en Tauride.