Church of the Apostles
The cruciform plan was a landmark development in Christian architecture, because it replaced a basilica plan with the centralized shrine plan. Dozens of cruciform church buildings in the late fourth and early fifth centuries were rough imitations of the Constantine-era Church of the Holy Apostles, such as St. Ambrose's Church of the Apostles in Milan, the martyrium of St. Babylas in Antioch, and the Church of Saint Simeon Stylites in Aleppo, Syria.