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180 CE - 241 CE: Life of Ardashir I, founder of the Sassanian Empire.
187 CE: Ardashir I, then age 7, is sent by his father to learn military and administrative skills at Fort Darabgerd.
200 CE: Ardashir I has succeeded the commander of Fort Darabgerd; accomplished in military and administrative skills.
200 CE: Ardashir I participates in the rebellion to unseat the satrap of Persis Guchehr; Ardashir's father assumes the throne of the region.
208 CE: Ardashir I's older brother Shapur killed in an accident; Ardashir proclaims himself king of Persis.
211 CE: Ardashir, king (malakh) of Persis, revolts against the Parthians and founds the Sasanian Empire.
224 CE - 240 CE: Reign of Ardashir I, who reformed the Persia by centralizing power, making Zoroastrianism state religion, and rivalling Rome.
224 CE: Ardashir I defeats Artabans IV at the Battle of Hormozdgan; Parthian Empire falls and Ardashir founds Sassanian Empire.
224 CE - 227 CE: Ardashir I consolidates his power and establishes the Sassanian Empire.
224 CE - 227 CE: Probable dates for the coronation of Ardashir I as king of the Sassanian Empire.
229 CE: Ardashir I and Shapur I drive the Romans from Mesopotamia and Syria.
229 CE - 233 CE: Ardashir I's war with Rome; Romans under Alexander Severus are defeated.
235 CE - 237 CE: Ardashir I passes throne to his son Shapur I.
240 CE: Shapur I becomes king of the Sassanian Empire; Ardashir I advises until his death in c. 241 CE.