"In AD 325, the First Council of Nicaea, convened by the Roman
emperor Constantine, agreed that Easter would be the first Sunday after the first full moon after the vernal equinox.
The date for Easter Sunday on our calendar will always be in the range 22 March to 25 April. The last time it fell on 22 March was 1818, and the next time will be 2285. For the upper end of the range, the last time it fell on 25 April was in 1943, and this will next happen in 2038." CMI