Rav Mari bar Rachel bat Shmuel, also known as Mari Breh deBat Shmuel was a Babylonian rabbi from the third and fourth generations of amoraim.
The accepted explanation for this is that his mother was taken captive by non-Jews,[1] and in captivity became pregnant via a Babylonian soldier later known as Issur Giura ("Issur the convert"), who then converted to Judaism before Mari was born.
[3] A different Talmudic passage asserts that Mari's father was a Jew named Rava.
To reconcile the contradiction, the Talmud concludes that "there were two Rav Mari bar Rachels", with the different passages referring to different individuals.
[4] However, Rashi and Tosafot to the passage argue that both the descent from Rava, and the explanation that there were two Maris, are not from the original Talmudic text, but rather are an erroneous later addition.