Whitsunday, an annual Christian festival marking the descent of the Holy Ghost upon the disciples, is celebrated on the 7th Sunday after Easter (which normally falls on or near this date). However, like most Christian holidays, Whitsunday was at one time a Pagan fertility festival. It was celebrated in Europe with a "heathen feast" the marked the death of the spirit of Winter and the birth of the Spirit of Summer.
According to English folklore, if a baby comes into the world on Whitsunday, he or she is destined to either commit an act of murder or to become murdered.