halcyon

(Greek mythology) a woman who was turned into a kingfisher

a large kingfisher widely distributed in warmer parts of the Old World

a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves

idyllically calm and peaceful; suggesting happy tranquillity; "a halcyon atmosphere"

marked by peace and prosperity; "a golden era"; "the halcyon days of the clipper trade"