This tide was called by the older liturgists "Quinquagesima paschalis" or "Quin. laetitiae". The octave of Easter which closes after Saturday has its own peculiar Office. Since this octave is part and complement of the Easter Solemnity, Paschal Tide in the liturgical books commences with the First Vespers of Low Sunday and ends before the First Vespers of Trinity Sunday. On Easter Sunday the Armenian Church keeps the Commemoration of All the Faithful Departed and on Saturday of Easter Week the Decollation of St. John. The Orthodox (Greek) Church celebrates on Friday of Easter Week the feast of Our Lady, the Living Fountain (shrine at Constantinople).