In Greek mythology, Creon son of Lycaethus was king of Corinth, father of Glauce (Creusa) and Hippotes, and host of Jason and Medea. When he betrothed his daughter to Jason, Medea's poisoned gifts killed bride and father together. Distinct from Creon son of Menoeceus, the Theban regent of the Oedipus saga—though Hyginus conflates the two.
Adapted from Wikipedia, "Creon (king of Corinth)" · CC BY-SA 4.0
I.Jason, Glauce, and Medea's revenge
Apollodorus knows Creon as Corinth's king after Jason and Medea have lived there ten years: he betroths his daughter Glauce to Jason; Jason divorces Medea; Medea sends a poisoned robe, and Creon dies in the same fire while trying to save his child. Hyginus tells the same marriage under the bride-name Creusa and calls the king son of Menoeceus—folding Corinthian and Theban Creons—while Apollodorus keeps the Corinthian figure separate from the Theban line.
Euripides' Medea stages the political hospitality and the lethal wedding gifts that make Creon's death inseparable from Glauce's.
II.Foster-father of Alcmaeon's children
A lost Euripidean plot summarized in the Bibliotheca has Alcmaeon entrust to Creon his children by Manto—Amphilochus and Tisiphone. The queen, fearing Creon might prefer the beautiful Tisiphone, sells the girl into slavery; Alcmaeon later buys his own daughter unawares and learns the truth only when he returns to Corinth for the children.
The atlas id creon-corinth locks the Corinthian king against the Theban creon of the Labdacid tragedies.