In 263, after his return, Odaenathus assumed the title of King of Kings of the East ("Mlk Mlk dy Mdnh"), and crowned his son Herodianus (Hairan I) as co-King of Kings. A statue was erected and dedicated for Herodianus to celebrate his coronation by Septimius Worod, the "duumviri" (magistrate) of Palmyra, and Julius Aurelius, the Queen's "procurator" (treasurer). The dedication, in Greek, is undated, but Septimius Worod was a "duumviri" between 263 and 264. Hence, the coronation took place c. 263. Contemporary evidence for Odaenathus bearing the title of King of Kings is lacking; all firmly dated inscriptions attesting Odaenathus with the title were commissioned after his death, including one that is dated to 271. However, Herodianus died with his father, and since he is directly attested as "King of Kings" during his father's lifetime, it is unimaginable that Odaenathus was simply a king while his son was the King of Kings. An undated inscription, written in Greek and difficult to decipher, found on a stone reused in the Palmyrene Camp of Diocletian, addresses Odaenathus as King of Kings ("Rex regum") and was probably set during his reign.