Ultimately, the Romans. The High Priests wanted him dead, but the High Priests did not have more say in the situation than the Roman procurator (Pilate) did. Pilate, of course, tried to "wash his hands" of the whole thing, but that does not change the fact that Pilate could have stopped it - he didn't.

Pilate was not Emperor, he was Governor.

Pilate's Dream was created in 1971.

first he was sent to Pilate and Pilate believed he was the king so he sent him to Herod and Herod believe him too so he sent him back to Pilate.

Pilate was greatly upset according to history , so was his wife that Pilate in the end commited suicide.