Worst Roman Emperor of all???

[Jona Lendering]

Phillip the Arab...was it him who was murdered by his troops after selling out to the Sassanid's?

The other way round: after Gordian III had been defeated and killed, Philip was made emperor. Shapur I even claimed that Philip owed the throne to him. Look at this relief in Bishapur:

On horseback, Shapur, holding Valerian (captured 260) in the hand; Gordian, dead, below the horse; Philip, kneeling; two Sasanian noblemen to the right. The same story, minus the dead Gordian, can be seen on the famous relief in Naqsh-e Rustam - to the right you can see Kartir, a Zoroastrian highpriest.

And that was, in combination with the evening news, enough Iran for today.