Pope Leo XIV on Saturday said the Catholic Church is open to establishing a common date of Easter among all Christian churches, echoing one of the aims of the Council of Nicaea that met 1,700 years ago.

During his first Pentecost as pope, Pope Leo XIV urged Catholics to embrace the Holy Spirit as a source of freedom and grace and to live the Beatitudes in spreading the Gospel.

This weekend, the Church celebrates Pentecost, one of the most important feast days of the year, which concludes the Easter season and celebrates the birth of the Church.

Pope Leo XIV celebrated Mass for the Solemnity of Pentecost in St. Peter’s Square on Sunday with international pilgrims belonging to new Church movements, associations, and communities celebrating this year’s Jubilee Year of Hope in Rome.

In the summer of A.D. 325, more than 300 bishops gathered in Nicaea — located in modern-day northern Turkey — to promulgate a common Christian creed, settle Christological disputes that arose from the Arian heresy, and promote unity in the Church.