Khosrow II (aka Kosrau II, r. 590-628) was the last powerful shahanshah (king of kings) of the Sassanian Empire. Grandson of Kosrau I (r. 531-579) and near-conqueror of the Byzantine Empire in the Byzantine-Sassanian War of 602-628, Khosrow II was a devout Zoroastrian, whose favorite wife, Shireen, was a Christian. His reign marks the end of classical Zoroastrian culture before the Islamic conquest of modern-day Iran in 651.
This is a companion discussion topic for the original content at https://www.worldhistory.org/Khosrow_II/.