As anticipation builds for the official inauguration of Pope Leo XIV, the Vatican prepares for a historic liturgical event on Sunday, May 18, at 10 a.m. local time in the heart of St. Peter’s Square. This solemn Mass will mark his installation as the 267th bishop of Rome and successor to St. Peter.

Liturgists note that the rite will be steeped in centuries-old symbolism. Before the celebration begins, Pope Leo will descend in prayer to the tomb of the Apostle Peter — a private moment of reflection joined by Eastern Catholic patriarchs, symbolizing reconciliation and unity between the Western and Eastern Churches.

As the procession to the altar unfolds, the ancient chant “Laudes Regiae” — a sacred hymn of royal acclamation dating back to the time of Charlemagne — will echo through the square. This chant affirms the foundational Christian belief that true authority flows not from thrones, but from the divine.

During the Mass, two sacred symbols of the papacy will be conferred upon the new pontiff, described in detail by liturgical scholar Victoria Cardiel.

Pope Leo XIV’s election on May 8 sent waves of jubilation through Eastern Christian communities, many of whom see his theological depth and ecumenical openness as a sign of renewed dialogue between traditions. His Augustinian background and ties to the African Church only deepen his global resonance.

Since his election, Pope Leo XIV has signaled a renewed commitment to the Church’s Social Doctrine — urging the faithful to remain open to God’s grace as they confront the moral and structural challenges of modern society.

Social media has come alive with images and video clips revealing Pope Leo’s lesser-known chapter as a missionary bishop in Peru. The content — full of pastoral warmth and service — has captivated the faithful worldwide, highlighting a papacy rooted not in power, but in personal encounter.