LARRY HURTADO: The “Thorny Crown.” Was the idea of the "thorny crown" placed on the head of Jesus according to the Gospels meant as a jeering representation an imperial "radiate" (spikey) crown?"
That idea might provide a better explanation of numismatic evidence pointed to in this story. If so, the thorny crown referred to in the Gospels was a satirical reference to the crown some rulers are shown wearing on ancient coins. That doesn't mean that any of the people depicted in those coins were Jesus.