Labdacus was a character from Greek mythology, known as the son of Polydectes and Lycaon. He was a king of Thebes and is often associated with the tragic fate of his family, which included the infamous Oedipus. His lineage is significant in the context of the Theban Cycle, a series of myths surrounding the city of Thebes. Labdacus's life and legacy are marked by themes of fate and tragedy, as his descendants faced numerous challenges and misfortunes, ultimately leading to the downfall of the Labdacids dynasty.