User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-5247339-20130703090010/@comment-3146930-20130715033232

Polygamy is when you have multiple wives. Hephaestus on the other hand has different wives depending on the source of the information. He is never said to be married to Aphrodite and Aglaia at the same time after all.