Was Jesus Circumcised for the Romans to nail the plaque 'King of the Jews' above his head on the Cross? Historically, checking for circumcision was the surest way to determine who is a Jew or a Gentile. So does the plaque nailed to the cross by the Romans confirm that Jesus was circumcised?
We know that Jesus was circumcised because we are told that he was in the book of Luke:

Luke 2:21  KJV


  And when eight days were accomplished for the circumcising of the child, his name was called JESUS, which was so named of the angel before he was conceived in the womb. 


As Jesus said to the Sadducees:

Matthew 22:29  KJV


  Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God. 


The Covenant requiring circumcision was with Abraham, and the Jews are the descendants of Israel, but they are only one of the  Nations descended from Abraham, others include the descendants of Ishmael, of Esau, and that includes most of the Arabian peninsula nations.