Alexandru IV Iliaș was the son of Ilie, or Iliaș, himself son of Alexandru IV Lăpușneanu, Prince of Moldavia.

His father was elected Prince of Wallachia in March 1591 but he could not win against Radu.

Alexandru IV was approved Prince of Wallachia by the Ottomans from September 1616 to November 1618 and from October 1629 to September 10, 1630.

He was also Prince of Moldavia under the name Alexandru Ilie from September 10, 1620 (after the Battle of Țuțora) to October 1621 and from December 1631 to April 1633; he died the same year (or 1666).

From an unknown wife he left two sons: