Mulek was the only son of Zedekiah, the last king of Judah, to survive the Babylonian conquest of Jerusalem. His brothers were slain and his father was blinded and carried captive to Babylon, but Mulek escaped and was brought by the hand of God to the promised land (Helaman 8:21). The biblical record does not mention him.
His descendants, who came out from Jerusalem at the time Zedekiah was taken to Babylon, journeyed across the great waters and settled in the land later called Zarahemla, after their leader at the time they were found. The people of Mosiah, descendants of Nephi, discovered them there; by then they had grown numerous, had no records, and spoke a language Mosiah could not understand. After the people of Zarahemla were taught Mosiah’s language, the two groups united and made Mosiah their king (Omni 1:14-19). Zarahemla, their leader, was a descendant of Mulek (Mosiah 25:2). The land north was named Mulek after him, the land into which the Lord had brought him (Helaman 6:10).