 Hairan I : the name appears on a 251 inscription from Palmyra describing him as Ras implying that he was already an adult by then . In the Augustan History , Odaenathus ' eldest son is named <unk> ; the inscription at Palmyra dating to 263 celebrating Hairan 's coronation mentions him with the name Herodianus . It is possible that Hairan of the 251 inscription is not the same as Herodianus of the 263 , but this is contested by Hartmann who conclude that the reason for the difference in the spelling is due to the language used in the inscription ( Herodianus being the Greek version ) , meaning that Odaenathus ' eldest son and co @-@ king is Hairan Herodianus . 
