Easter is the feast of the Resurrection of Jesus Christ from the dead — the oldest, highest, and most central celebration of the Christian year. Every other movable feast and fast is calculated from it; every Sunday is a weekly Easter. The date is determined by the Paschal computation established at the Council of Nicaea (325): Easter falls on the first Sunday after the first full moon on or after the vernal equinox (March 21), placing it between March 22 and April 25. The earliest Christians appear to have observed an annual Pascha from a very early period, though the precise origins are debated. The Quartodeciman controversy of the second century — whether to celebrate the Pascha on Nisan 14 (regardless of the day of the week) or always on a Sunday — attests that the observance was already widespread and deeply important by the mid-100s. Polycarp of Smyrna reportedly discussed the matter with Anicetus of Rome around 155 (Eusebius, HE 5.24), and the issue was sharp enough to prompt Victor of Rome to threaten excommunication of the Asian churches, a threat moderated by Irenaeus's famous appeal for peace. The Nicene resolution in favor of the Sunday observance became universal in the mainstream Church, though some groups maintained the Quartodeciman practice for centuries. The Great Vigil of Easter is among the most ancient liturgies in Christianity, with roots traceable to at least the third century (Apostolic Tradition). By the fourth century, Egeria describes an elaborate Jerusalem vigil with baptisms, and Augustine attests a similar pattern in North Africa.

The Great Vigil, which the BCP 2019 describes as 'the first liturgy of Easter Day,' begins in darkness. The Paschal Candle is lit from new fire — a symbol of Christ as the light of the world entering the darkness of the tomb. The Exsultet, the great hymn of praise to the Paschal Candle, is among the most magnificent pieces of Christian hymnody, attested from at least the fourth century (Ambrose may have composed an early version). The vigil readings trace salvation history from creation through the Exodus to the prophets, building to the proclamation of the Resurrection Gospel. Historically, the Vigil was the primary occasion for baptism — new Christians dying and rising with Christ through the waters, emerging to receive their first Eucharist on the night of the Resurrection. The BCP 2019 provides for baptism or renewal of baptismal vows at the Vigil. The Easter morning liturgy opens with the Paschal greeting: 'Alleluia! Christ is risen! / The Lord is risen indeed! Alleluia!' — a form attested across virtually every Christian tradition. The fifty days of Eastertide that follow (through Pentecost) are treated as a single unbroken feast — no fasting, no kneeling for prayer, Alleluias throughout. Easter eggs, the custom of which is documented from at least the thirteenth century, symbolize the sealed tomb and new life breaking forth. Easter is not a day but a season.

George is first mentioned as a martyr in the Onomasticon (place-name dictionary) of Eusebius of Caesarea, a work compiled early in the 4th century. Eusebius notes that a church in Lydda was dedicated to George (possibly referring to the shrine erected after his death). However, Eusebius's Ecclesiastical History, which chronicles the Diocletian persecution in detail (Book VIII), makes no specific mention of George. This silence is significant: if George had been a prominent bishop or ecclesiastical figure, Eusebius almost certainly would have named him.

George was apparently a soldier (a miles, or warrior) who died during the persecution. He was venerated very early, and Lydda became a pilgrimage site. A Passio Georgii exists, but it is much later (likely 5th–6th century at earliest) and contains extensive legendary material. By the 6th century, George was widely venerated in the Eastern Church, and by the medieval period, he was celebrated across Christendom.

The most celebrated feature of George's hagiography — the dragon slaying — appears only in medieval sources, first attested in the 12th-century Golden Legend of Jacobus de Voragine. It is a literary topos with no historical basis. George became the patron of warriors and soldiers, and the dragon-slaying image became central to his medieval iconography.

Traditionally, George was a wealthy Roman soldier who was arrested, severely tortured, and ultimately executed for his Christian faith and refusal to sacrifice to pagan gods. The famous dragon legend, first fully attested in the Golden Legend (12th century), describes George slaying a dragon that had been terrorizing a city — a rescue that was said to have converted thousands and led to his veneration. This legend has no basis in early sources and is a medieval literary invention. George is traditionally depicted with a dragon beneath his feet or lance.