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Shahrbaraz usurped the throne of the Sasanian Empire from Ardashir III, but was himself killed six weeks later.

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Shahrbaraz
Shah of the Sasanian Empire in 630
Shahrbaraz was shah (king) of the Sasanian Empire from 27 April 630 to 9 June 630. He usurped the throne from Ardashir III, and was killed by Iranian nobles after forty days. Before usurping the Sasanian throne he was a spahbed (general) under Khosrow II (590–628). He is…Source: Wikipedia (CC BY-SA)
Sasanian Empire
Last pre-Islamic Iranian empire (224–651 AD)
The Sasanian Empire, officially Eranshahr, was an Iranian empire that was founded and ruled by the House of Sasan from 224 to 651. Enduring for over four centuries, the length of the Sasanian dynasty's reign over ancient Iran was second only to the directly preceding Arsacid…Source: Wikipedia (CC BY-SA)
Ardashir III
Shah of the Sasanian Empire from 628 to 630
Ardashir III was the Sasanian King of Kings of Iran from 6 September 628 to 27 April 630.Source: Wikipedia (CC BY-SA)