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Madai (Hebrew: מָדַי, pronounced [maˈda.i]; Greek: Μηδος, [mɛːˈdos]) is a son of Japheth and one of the 16 grandsons of Noah in the Book of Genesis of the Hebrew Bible. Biblical scholars have generally identified Madai with the Iranian Medes of much later records. The Medes, reckoned to be his offspring by Josephus and most subsequent writers, were also known as Madai, including in both Assyrian and Hebrew sources. Some scholars in more modern times have also proposed connections with various earlier nations, such as Mitanni, Matiene, and Mannai. In addition, the Kurds still maintain traditions of descent from Madai.
According to the Book of Jubilees (10:35-36), 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.
Medos (Μηδος), and his mother Medea, were also reckoned to be the ancestors of the Medes in classical Greek mythical history. Christian scholars have proposed linking Hebrew Madai and Greek Medos since at least the time of Isidore of Seville [Etym 9.2.28], ca. 600 AD.