The descent of the Holy Spirit on the Apostles is a significant event in Christian history. It is the moment when the Apostles received the Holy Spirit and began to spread the teachings of Christ. This event is also known as the Pentecost, which is a synonym for the descent of the Holy Spirit on the Apostles. Other synonyms for this event include the coming of the Holy Spirit, the outpouring of the Holy Spirit, and the baptism of the Holy Spirit. The importance of this event cannot be overstated as it marks the birth of Christianity and the beginning of the Church.