Origin of Halcyon
The English adjective halcyon “calm; peaceful; tranquil” is rooted in ancient Greek—and classical mythology. Halcyon ultimately derives via Latin alcyōn from Greek alkyṓn “kingfisher.” In ancient myths, the halcyon named a bird, usually identified with the kingfisher, that was said to breed around the time of the winter solstice in a nest floating on the sea, and was believed to have the power to charm the winds and waves into calmness. Halcyon frequently occurs in the expression halcyon days, a period of calm weather in the winter, historically a stretch of fourteen days around the winter solstice connected with (the myth of) breeding kingfishers. Halcyon days evolved to mean, more broadly, “a time of peace and prosperity,” and the adjective halcyon evolved to mean, variously, “calm; rich; carefree.” Halcyon is recorded in English by the late 1300s.