The Four Marks of the Church, also known as the Attributes of the Church, describe four distinctive adjectives of traditional Christian ecclesiology as expressed in the Nicene Creed completed at the F
Icon depicting the Emperor Constantine, accompanied by the bishops of the First Council of Nicaea (AD 325), holding the Niceno–Constantinopolitan Creed of 381
"One Church", illustration of Article 7 of the Augsburg Confession
The Catholic Church, also called the Roman Catholic Church, is the largest Christian church, with an estimated 1.28 to 1.41 billion baptized members worldwide as of 2026. It consists of 24 autonomous
Four Marks of the Church
…Constantinople in AD 381: "[We believe] in one, holy, catholic, and apostolic Church." This ecumenical creed is today recited in the liturgies of the Catholic Church (both Latin and Eastern Rites), the Eastern Orthodox Church, the Oriental Orthodox Churches, the Assyrian Church of the East, the Moravian Church, the…
St. Peter's Basilica in Vatican City, the largest Catholic church building in the world
The first use of the term "Catholic Church", meaning "universal church", was by the Church Father Saint Ignatius of Antioch in his Letter to the Smyrnaeans in c. 110 AD. Ignatius of Antioch also is credited with the first recorded use of the term Christianity ten years earlier, in c. 100 AD. He died in Rome, with his relics located in San Clemente al Laterano.
A c. 1481–1482 fresco by Pietro Perugino in the Sistine Chapel showing Jesus giving the keys of heaven to Saint Peter
The Last Supper in the Santa Maria delle Grazie Church in Milan, Italy, a late 1490s mural painting by Leonardo da Vinci, depicting the Last Supper of Jesus and his twelve apostles, depicts the final meal of Jesus before his crucifixion and death.