According to the Book of Jubilees (10:50-51), Madai had married a daughter of Shem, and preferred to live among Shem's descendants, rather than dwell in Japheth's allotted inheritance beyond the Black Sea; so he begged his brothers-in-law, Elam, Asshur and Arphaxad, until he finally received from them the land that was named after him, Media.