226 Consul II (with Gaius Aufidius Marcellus II); marriage to Sallustia Orbiana, daughter of the praetorian prefect Lucius Seius Sallustius; Ardašir captures the capital of the Parthian Empire, Ctesiphon, and is the first ruler of the Sasanian dynasty
227 Seius Sallustius tries to become emperor, but is killed; the empress Orbiana is sent into exile
231 Severus Alexander leaves Rome and goes to the east; end of the usurpation of Uranius in Emesa
232 Arrives in Syria, stays in Antioch; negotiations fail
233 Alexander inconclusively fights against the Persians but the status quo is restored; celebrates triumph in Rome; meanwhile, the Alamanni become restless and destoy the limes in the Black Forest.
234 Alexander goes to the Rhine, where he wants to fight against the Germanic tribes; attempts negotiations first
