The Season of Apostles (also known by various Syriac transliterations, such as Slihe and Shleehe) is a liturgical season in East Syriac Christianity.
The season begins with the feast of Pentecost and continues for seven weeks.
[2] It also marks the half of a year according to the Gregorian Calendar.
The season is so named because it commemorates the missionary activities of the apostles of Jesus after the events of Pentecost.
The following feasts are fixed to certain days in the Season of Apostles:[3][4] The season ends with the Feast of the Twelve Apostles on the First Sunday of Summer.