Was Hephaestus the husband of Athena?
No, he was not. Hephaestus was the husband of Aphrodite. Aphrodite was the goddess of love, and often cheated on Hephaestus with Ares, the god of war.
It's an interesting story. Athena visited Hephaestus once to ask for some weapons, but he thought that she had come to seduce him, and he attempted to rape her. Athena managed to escape, and Hephaestus ended up fertilizing the earth. Later, Erichthonius was born, and Athena hid the baby in a box and gave it to the three daughters of Cecrops.
Athena did not have a baby. According to the Bibliotheca, Athena visited the smith-god Hephaestus to request some weapons, but Hephaestus was so overcome by desire that he tried to seduce her in his workshop. Determined to maintain her virginity, Athena fled, pursued by Hephaestus. Despite Hephaestus' lameness, he caught Athena and tried to rape her, but she fought him off. During the struggle, his semen fell on her thigh, and Athena, in disgust, wiped…