The development of octaves occurred slowly. From the 4th century to the 7th century, Christians observed octaves with a celebration on the eighth day, with little development of the liturgies of the intervening days. Christmas was the next feast to receive an octave. By the 8th century, Rome had developed liturgical octaves not only for Easter, Pentecost, and Christmas, but also for the Epiphany and the feast of the dedication of a church. From the seventh century, saints' feasts also began to have octaves (an eighth-day feast, not eight days of feasts), among the oldest being the feasts of Saints Peter and Paul, Saint Lawrence and Saint Agnes. From the twelfth century, the custom developed of liturgical observance of the days between the first and the eighth day, as well as the eighth day. During the Middle Ages, octaves for various other feasts and saints were celebrated depending upon the diocese or religious order.