In a series of rapid and successful campaigns starting in 262, Odaenathus crossed the Euphrates and recovered Carrhae and Nisibis. He then took the offensive into the heartland of Persia, and arrived at the walls of its capital, Ctesiphon. The city withstood the short siege but Odaenathus reclaimed the entirety of the Roman lands occupied by the Persians since the beginning of their invasions in 252. Odaenathus celebrated his victories and declared himself "King of Kings", crowning his son Herodianus as co-king. By 263, Odaenathus was in effective control of the Levant, Roman Mesopotamia and Anatolia's eastern region.