Humiliation and the crown of thorns

Mark 15:16 And the soldiers led him away into the hall, called Praetorium; and they call together the whole band. Matt 27:27 Then the soldiers of the governor took Jesus into the common hall, and gathered unto him the whole band of soldiers.  
Mark 15:17 And they clothed him with purple, and platted a crown of thorns, and put it about his head, 18 And began to salute him, Hail, King of the Jews! 19 And they smote him on the head with a reed, and did spit upon him, and bowing their knees worshipped him. Matt 27:28 And they stripped him, and put on him a scarlet robe. 29 And when they had platted a crown of thorns, they put it upon his head, and a reed in his right hand: and they bowed the knee before him, and mocked him, saying, Hail, King of the Jews! 30 And they spit upon him, and took the reed, and smote him on the head. John 19:2 And the soldiers platted a crown of thorns, and put it on his head, and they put on him a purple robe, 3 And said, Hail, King of the Jews! and they smote him with their hands.

See also Luke 23:11.