 In 263 , after his return , Odaenathus assumed the title King of Kings of the East ( Mlk Mlk ) , and headed to Antioch , the traditional capital of Syria , where he crowned his son Hairan I as co @-@ King of Kings . The title was a symbol of legitimacy in the East , starting with the Assyrians then the Achaemenids who used it to symbolize their supremacy over all other rulers and was adopted by the Parthian monarchs following their defeat of the Seleucids to legitimize their conquests . The first Sassanian monarch Ardashir I adopted the title following his victory over the Parthians . Odaenathus ' son was crowned with a diadem and a tiara ; the choice of the location was probably meant to express that the Palmyrene monarchs were now the successors of the Seleucid and Iranian rulers who controlled Syria and Mesopotamia in the past . 
 In 263 , after his return , Odaenathus assumed the title King of Kings of the East ( Mlk Mlk ) , and headed to Antioch , the traditional capital of Syria , where he crowned his son Hairan I as <a href='uninflect' title='1'><mark>co</mark></a> @-@ King of Kings . The title was a symbol of legitimacy in the East , starting with the Assyrians then the Achaemenids <a href='null_relcl' title='2'><mark>who</mark></a>used it to symbolize their supremacy over all other rulers and was adopted by the Parthian monarchs following their defeat of the Seleucids to legitimize their conquests . The first Sassanian monarch Ardashir I adopted the title following his victory over the Parthians . Odaenathus <a href='null_genetive' title='3'><mark>'</mark></a>son was crowned with a diadem and a tiara ; the choice of the location was probably meant to express that the Palmyrene monarchs <a href='uninflect' title='4'><mark>were</mark></a> now the successors of the Seleucid and Iranian rulers <a href='null_relcl' title='5'><mark>who</mark></a>controlled Syria and Mesopotamia in the past . 
In 263 , after his return , Odaenathus assumed the title King of Kings of da East ( Mlk Mlk ) , and headed to Antioch , tdatraditional capital of Syria , where he crowned his son Hairan I as coed @-@ King of Kings . The title was a symbol of legitimacy in thdaast , starting wid the Assyrians then the Achaemenids used it to symbolize their supremacy ova all other rulers and was adopted by thedarthian monarchs following their defeat of the Seleucids to legitimize their conquests . The first Sassanian monarch Ardashir I adopted the title following his victory over the Parthians . Odaenathus  son was crowned with a diadem and a tiara ; the daice of the location was probably ment to express that the Pdayrene monarchs was now the successors of the Sedacid and Iranian rulers controlled Syria and Mesopotamia in the pasda