Halcyon Days
Alkyon was one of the seven daughters of Aeolos, god of the winds. Her husband was king Ceynx, who in turn was the son of the deity Eosphorus (Hesperius). Ceynx was very content with his wife and life, and decided this happiness was reason enough for him to call his wife Hera, after the queen of the gods. He also made Alkyon call him Zeus. This, of course, inflicted the wrath of the gods, and the couple were changed into birds as a punishment for their hubris.
According to another myth, Ceynx drowned in a shipwreck during a trip to consult an oracle. Alkyon was so much in love with her husband that when she heard of his death, she jumped from a cliff, so that they could be together for all eternity. The gods took pity on them, and transformed the into sea birds. Alcyone was turned into a Kingfisher, or Halcyon, and Ceynx into a Gannet, or Ceyx.
The Kingfisher has its nesting period during the winter solstice. Alkyon's father, Aeolos, ensures that the winds don’t blow and the weather is warm for some days after the 15th January - when the eggs of these birds hatch. During the winter months when the weather is calm for a few days, the Greeks say we have "Halcyon days".