Theseus was the fruit of dual paternity: Aegeus King of Athens slept with Aethra when she had just been raped by Poseidon, God of the Sea. Theseus, who grew into a strong, brave young man, therefore had a double lineage - both divine and royal. But Theseus' great courage did not stop him from neglecting his duties. Carried along by his victory, he committed a few irreversible oversights.