This is the famous story of Rabban Shimon ben Gamliel
when he was forced to bring his baby to the Roman
emperor because he had given him a Bris, which was
forbidden On the way there, they stopped at an inn
where a non-Jewish woman offerd to switch babies with
them for the trip so they wouldnt be sentenced to death
They did so, and the Jewish boy grew up to be Rabbi
Yehuda HaNasi w stayed friends with the non Jewish boy
who grew up to be Emperor Antoninus |