Feast of the Holy Trinity
Feast of the Holy Trinity is held on June 15. This event in the second decade of the month June is annual. 
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On the Sunday after Pentecost, the Catholic Church celebrates the feast of the Holy Trinity every year (known as "Trinitatis" in the Protestant Church).
The feast of the Holy Trinity found its way into the church liturgy as early as the 9th century. At that time, it was first celebrated in Benedictine monasteries. It was officially introduced in the Catholic Church in 1334 and celebrated on the first Sunday after Pentecost. In many Catholic regions, this festival is celebrated with solemn processions. The liturgical color for this feast is white, the color of purity.
Similar holidays and events, festivals and interesting facts
Whit Monday according to Eastern Christian tradition on June 9
St. Bartholomew's Day in the Catholic and Protestant churches on August 24
World Day of Prayer for the Care of Creation on September 1
Beginning of the Orthodox Church Year on September 1
Nativity of the Virgin Mary on September 8
Feast of the Exaltation of the Holy Cross on September 14
The Feast of Christ the King on November 24 (Date for 2024. Celebrated on the last Sunday before Advent. Roman Catholic Church)