Faithful to its religious nature, one of the fundamental aspects in the life of the Constantinian Order is the participation of its members on the Holy Mass. The knights, ladies and ecclesiastics of the Order participate in the religious life of their geographical and diocesan sphere both spiritually and liturgically.

The knights, ladies and ecclesiastics of the Order participate in the religious manifestations of civic life; they attend processions such as Corpus Christi, Easter or the festivities in their local area (among others) and especially in the religious rituals on behalf of our patron, Saint George. The Order has its canonical masterly seat in the chapel of St. George in the Roman basilica of Santa Croce in Via Flaminia, which was built with the contribution of the Constantinian Order, between 1912 and 1918. The great annual solemn ceremonies of the Order, have been celebrated here: for example, St. George’s and the Feast of the Exaltation of the Holy Cross.

The National Commissions and regional Delegations of the Order have chapels in different cathedrals, basilicas and churches that are used as canonical headquarters of their respective territorial demarcations.

For example, the chapel of the Visitation in the Cathedral of Barcelona, or the chapel of Saint George in the Military Parish Church in the same city – seats of the Delegation of the Order in Catalonia. The Order regularly celebrates its rites in other sacred places such as the Military Cathedral of Madrid, the Cathedral of Nola in the province of Naples, the Cathedral of Notre-Dame in Luxembourg, the Basilica of the Annunciation in Florence, the Basilica of Padova, the Basilica of Our Lady of the Martyrs in Lisbon (with the annexed hostel, whose construction was funded by the Order), the churches of the Ascension of Chiaia in Naples, or the Church of the Holy Trinity and the convent attached to the Hermitages of St. Augustine in Viterbo.