In Greek mythology, Megapenthes (; Ancient Greek: Μεγαπένθης, romanized: Megapénthēs, lit. 'great sorrow' or '"great mourning') was a king of Argos.
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Family
Megapenthes was the son and successor of Proetus and father of either Argeus or Anaxagoras (in some accounts, Anaxagoras was his grandson through Argeus). He also had a daughter Iphianeira, who married Melampus.
Mythology
Megapenthes exchanged kingdoms (Argos for Tiryns) with his cousin Perseus whom he killed much later.