One of the four great Celtic festivals held annually was Beltane.It was celebrated on 1 May and marked the beginning of the Celtic summer.It was named after Belenus and was asociated with bonfires lit the night before the festival.The ordinary household fires would be extinguished and the Druids would light bonfires,supposedly using torches lit by the rays of the sun.The festival was associated with regeneration and regrowth after the ravages of winter.