Dionysus

Dionysus was the son of Zeus and Semele, and he was the only god with a mortal parent. Zeus went to Semele in the night, unseen by human eyes, but could be felt as a divine presence. Semele was pleased to be the lover of a god, even though she did not know which one. Word soon got around and Hera quickly assumed who was responsible. She went to Semele in disguise and convinced her she should see her lover as he really was. When Zeus visited her again, she made him promise to grant her one wish. She went so far as to make him swear on the River Styx that he would grant her request. Zeus was madly in love and agreed. She then asked him to show her his true form. Zeus was unhappy knowing what was about to happen, but bound by his oath, he had no choice. He appeared in his true form and Semele was instantly burnt to a crisp by the sight of his glory. Zeus managed to rescue the fetal Dionysus and stitched him into his thigh until he would be ready to be born. His birth from Zeus conferred immortality upon him.