Easter is the most important religious holiday of the Christian liturgical year, observed in March, April, or May to celebrate the resurrection of Jesus, which Christians believe occurred after his death by crucifixion in AD 27-33 (see Good Friday). Easter can also refer to the season of the church year, lasting for fifty days, which follows this holiday and ends at Pentecost. The Easter festival is kept in many different ways among Western Christians. The traditional, liturgical observation of Easter, as practised among Roman Catholics and some Lutherans and Anglicans begins on the night of Holy Saturday with the Easter Vigil. This, the most important liturgy of the year, begins in total darkness with the blessing of the Easter fire, the lighting of the large Paschal candle (symbolic of the Risen Christ) and the chanting of the Exsultet or Easter Proclamation attributed to Saint Ambrose of Milan. A short introduction about Easter from the perspective of various religions, traditions and cultures, including Easter season, Easter bread, Easter eggs, greetings, etc.