The Cathedral of Saint John the Baptist (Primatiale Saint-Jean-Baptiste de Lyon), also known as Saint-Jean Cathedral, is the main Catholic church and the heart of old Lyon. Located in the historic Saint-Jean quarter, between the picturesque Fourvière Hill and the Saône River, it serves as the seat of the Archbishop of Lyon, who holds the honorary title of Primate of the Gauls. This is not only an important religious center of France but also an outstanding architectural monument included in the UNESCO World Heritage list.

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Construction of the cathedral spanned three centuries, from the 12th to the 15th century, which is reflected in its unique appearance. The building harmoniously combines Romanesque and Gothic features. Its eastern part, including the apse, is built in a strict Romanesque style, while the western facade, with its magnificent rose window and three portals, is a brilliant example of Gothic architecture. The facade is decorated with hundreds of stone medallions featuring scenes from the Old and New Testaments, signs of the zodiac, and sketches of medieval life.
One of the cathedral's main gems is the 14th-century astronomical clock—one of the oldest in the world. Several times a day, it not only tells the time but also performs a small show with moving figures depicting religious scenes. Inside, the church is striking in its grandeur, high vaults, and ancient 13th-century stained glass windows, creating a special atmosphere. A visit to Saint-Jean Cathedral is an opportunity to touch centuries of history and enjoy a masterpiece of medieval architecture.