By the 1736–37 season in London, the German-born Handel was presenting both operas he had composed in Italian, as he had done for more than twenty years, and oratorio in English, which was a newer form for him.
[1] In the middle of all this work, Handel suffered an illness which temporarily left his right hand paralyzed, as reported in the London Evening Post on 14 May 1737: "The ingenious Mr. Handel is very much indispos'd, and it's thought with a Pareletick Disorder, he having at present no Use of his Right Hand, which, if he don't regain, the Publick will be depriv'd of his fine Compositions.
"[1] Handel led the performances of his operas and oratorios from the keyboard and often played organ concertos between the acts; nevertheless he was absent from the theatre while he recovered, which he did fairly speedily although he suffered occasional relapses of this ailment for the rest of his life.
[1] Time: early 6th century Place: the Byzantine Empire In Constantinople, widowed Empress Arianna is celebrating her marriage to her new husband Anastasio when they receive news that they are threatened by a rebellion.
In a rural setting, the ploughboy Giustino is working his fields when he falls asleep and has a vision of great fortune awaiting him.
The maiden turns out to be Princess Leocasta, sister of Anastasio, and, much smitten by her rescuer Giustino, she invites him to the palace where he is acclaimed as a hero and sent to help Empress Arianna and her new husband against the rebel Vitaliano.
General Amanzio takes a sash covered in jewels that belonged to Vitaliano and gives it to Anastasio, suggesting to him that his wife is betraying him with Giustino.
Anastasio is restored to the throne with his wife, begging her pardon for having doubted her fidelity, and Giustino pleads for the now repentant Vitaliano to be forgiven.
[5] A number of the extended da capo arias feature oboe obbligato, specially written for the virtuoso instrumentalist Giuseppe Sammartini.
[6] The opera is scored for two recorders, bass flute, two oboes, bassoon, two horns, two trumpets, strings and continuo (cello, lute, harpsichord).