"Easter was first mentioned in a mid-second century Paschal homily believed to be written by Melito of Sandis (d.c.180) for reading aloud in the morning of Pascha, an earlier name for the feast. Originally, Easter was observed with Jweish Passover, but after the first council of Nicaea in 325 it was declared that Easter should be observed on Sunday, held to be the day of resurrection of Christ. The date was movable being the first Sunday after the first full moon after the spring equinox."