Interesting. I thought he was crucified as a result of blasphemy, which required the death penalty. The charge of blasphemy was true.
For example John 8:58-59 58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am. 59 Then took they up stones to cast at him: but Jesus hid himself, and went out of the temple, going through the midst of them, and so passed by.