cross-posted from: https://wolfballs.com/post/19152

cross-posted from: https://wolfballs.com/post/19151

Prime, or the First Hour, is a fixed time of prayer of the traditional Divine Office (Canonical Hours), said at the first hour of daylight (approximately 7:00 a.m.), between the morning Hour of Lauds and the 9 a.m. Hour of Terce. It is part of the Christian liturgies of Eastern Christianity, but in the Latin Rite it was suppressed by the liturgical reforms following the Second Vatican Council.[1]

As the chronology of Cassian's works has recently been established fairly accurately, the institution of Prime must be placed towards 382.[4]

So from 382-1960s (?) this was observed but the Vatican 2 church broke from this tradition....