Onkelos

Onkelos (Hebrew: אֻנְקְלוֹס ʾunqəlōs), possibly identical to Aquila of Sinope, was a Roman national who converted to Judaism in Tannaic times (c. 35–120 CE).

[3] This lack of mention of any other sibling, can easily be explained, that due to the conversion, his uncle had him expurgated from the historical record.

Whether historical or not, the story goes that his uncle, the emperor, advised Onkelos to go out and find something that wasn't worth much today but would be invaluable in the future.

[4] The first was his uncle Titus, who was blamed for the destruction of the Second Temple; the second was the seer Balaam, hired by Balak king of Moab to curse Israel; and the last was Yeshu, a name used for those who sought to lead Jews astray to idolatry, in particular an idolatrous former student of Joshua ben Perachiah in the Hasmonean period as well as Manasseh of Judah.

However, while Titus and Balaam dissuade him from converting, Yeshu encourages him to join the Jewish people (prompting the Talmud to praise "the sinners of Israel").

The second contubernium was also converted, after he juxtaposed God's personal guidance of Israel in the Book of Numbers to the Roman social hierarchy.