Justinian Code law issued by Justinian I [Byzantine Empire; Present-day Turkey, Italy] [Provisional]: “The Jews are permitted to circumcise their own sons. But if they should circumcise another, they shall be punished as castrators.” [Editor’s note: Author’s footnote dates this law in 533 as Justinian Code 48.8.11]
Linder, Amnon: “The Jews in the Legal Sources of the Early Middle Ages.” Page 54