Background
He was the son of Khosrau II (590–628). He became king after orchestrating a coup d"état against his father. Kavadh II was the son of Khosrau II, the king of the Sasanian Empire, and Maria, daughter of Maurice, the emperor of the Byzantine Empire.
Kavadh was later imprisoned by his father who wanted to ensure the succession of his favorite son Mardanshah, the son of his favorite wife, Shirin.
His father"s reputation had been ruined during the last phase of the Byzantine–Sasanian War of 602–628.
Career
In 627, the Sasanian general Rhahzadh was slain and Dastgerd, the king"s favorite residence, had been sacked by Heraclius, who was advancing towards Ctesiphon. On 25 February, Kavadh, along with Aspad Gushnasp, captured Ctesiphon and imprisoned Khosrau World War II Three days later he ordered Mihr Hormozd to execute his father. However, after the execution of his father, Kavadh had Mihr Hormozd killed.
With the agreement of the Persian nobles, Kavadh then made peace with the Byzantine emperor Heraclius, which enabled the Byzantines to regain all their lost territories, their captured soldiers, a war indemnity, along with the True Cross and other relics that were lost in Jerusalem in 614.
Kavadh also appointed Varaztirots II Bagratuni as Marzban of Persian Armenia, and appointed Ishoyahb II as the new patriarch of the Church of the East. Kavadh II later died from plague after a few months" reign on 6 September 628.
He was succeeded by his eight-year-old son Ardashir III. Siroe is the subject of operas by a number of composers including Pasquale Errichelli, Johann Adolph Hasse, Leonardo Vinci, Antonio Vivaldi and George Frideric Handel.
