Christianized sites

Many important places used to belong to old religions before Christianity became popular. When people started to believe in Christianity, they changed these places to match their new beliefs. This process is called Christianization.

One way they did this was by giving new Christian names to old sacred spots. For example, a beautiful island called Oglasa in the Tyrrhenian Sea was renamed Montecristo. This helped people remember their new faith while keeping the special meaning of the place.

Changing these sites helped spread Christianity and connect new believers to their history. It shows how different cultures mix together over time, creating a rich story of how people’s beliefs have changed.

Early Christianity

In the early years of Christianity, churches were often small meeting places in people’s homes or near the burial sites of holy people called martyrs and saints. Many of these sites were outside of cities. Over time, holy relics were kept inside city churches.

Many old temples used for pagan worship were no longer needed before Christianity became widespread. These temples were sometimes turned into new buildings or used for different purposes. After laws were passed, these old temples were closed and no longer used for worship. Christians at first avoided these places because of their history, and because the temple shapes were not right for Christian services. Instead, they used a type of building called a basilica, which was originally a secular building.

Ancient Rome and Greece

Rome

In Rome, many old buildings used for pagan worship became churches. Important places like the Roman Forum had temples such as the Curia Iulia, Temple of Antoninus and Faustina, and Temple of Romulus turned into churches. The famous Pantheon, once a temple for Roman gods, became a church for St. Mary and the Martyrs. This change started in the 6th and 7th centuries and continued into the Renaissance.

Some churches were built above burial places of early Christian leaders. This was new in Christianity, as older traditions did not usually allow burials near city centers.

Vatican

St. Peter's Basilica in the Vatican is thought to be where Simon Peter was buried. Digs under the basilica found old Roman mausoleums and a small structure called the aedicula, which looks like a tiny temple.

Greece

In Greece, many old pagan sites became Christian monasteries and churches. For example, the city of Aphrodisias was renamed Stauropolis, meaning "City of the Cross." Some temples in Athens, like the Askepieion and the Parthenon, were turned into churches. During Byzantine times, the Parthenon became a church for the Mother of God.

Middle Ages

Cassiodorus, the court secretary to the Ostrogoth Theodoric the Great, wrote about a fair held at a former pagan shrine in south Italy. This shrine was changed into a baptistery.

Sulpicius Severus wrote about Martin of Tours building churches and monasteries where heathen temples once stood. When Benedict of Nursia took over the site at Monte Cassino, he removed statues and altars. Montmartre in France, once called Mons Martis or "Mount of Mars," later became a place for Christian worship.

In Francia, an abbey was built at the ruins of an old settlement. The place still had special thermal baths. The Notre-Dame du Taur cathedral in Toulouse may have been built on the site of an old temple.

In Britain, there was a tradition that old temples were changed into churches. Pope Gregory I advised that idols should be removed but the buildings kept. Some Roman temples in Britain were changed into Christian sites. Holy wells and springs were often linked to local saints after Christianity spread. Trees that were once considered sacred were sometimes cut down.

During the Reconquista in the Iberian Peninsula, many mosques were changed into Christian churches. The Great Mosque of Cordoba became a cathedral in 1236. Santiago de Compostela became an important Christian pilgrimage site.

New World

The Spanish built many churches where Native American temples used to be, just like they changed Muslim mosques into churches in Spain. For example, the Mexico City Metropolitan Cathedral was built on an Aztec temple in Mexico. In Central America, large pyramid temples were also turned into Christian places of worship. Some of these sites now look like normal churches, with no sign of their past as temples.

Balkans

During the Ottoman conquest of the Balkans in the 15th century, many churches were changed into mosques. Later, in the 19th century, many of these places were turned back into churches. For example, the Sveti Sedmochislenitsi Church in Sofia was an old mosque that became a church. After Christian Balkan states became independent from the Ottoman Empire, they sometimes destroyed mosques and turned them into churches. In Croatia, the few remaining mosques from that time are now Catholic churches.

South Asia

Long ago, some special places that were used for Hindu, Sikh, or other traditions were changed for Christian worship. For example, many Hindu temples in areas like Goa were torn down, and their stones were sometimes used to build churches. In places such as Peshawar in Pakistan, tombs built for important leaders became places for Christian services. Even in small villages, shrines once used for Sikh traditions were changed for Christian use. These changes happened as people worked to share the Christian faith in new areas.

Today, some of these places are used again for their original purposes, while others still serve Christian communities.