Even in apostolic times, it was customary to begin the Church year with the celebration ... marks the beginning of the celebration of Pentecost as a feast honoring the Three-hypostatic God—the Holy ...

The feast of the Holy Trinity, which is celebrated on the Sunday after Pentecost, was established for the whole Western Church in 1134 by pope John XII. The Angelic Trisagion is said for the three ...

What the Catechism of the Catholic Church says on "The Trinity:" 232. "Christians are baptized 'in the name of the Father and of the Son and of the Holy Spirit' [Mt 28:19.] Before receiving the ...

The Feast of the Holy Theophany (Epiphany) of our Lord God and Savior Jesus Christ is celebrated each year on January 6. The Feast commemorates the Baptism of Christ and the divine revelation of the ...