The term "Romanesque-Byzantine" refers to an architectural style that combines elements from both the Romanesque and Byzantine traditions. This style is characterized by its use of rounded arches, thick walls, and large domes, often adorned with intricate mosaics and decorative elements. It emerged in Europe during the 11th and 12th centuries, reflecting the cultural exchange between the Western and Eastern Christian worlds. In Romanesque-Byzantine structures, you can often find features such as barrel vaults and ribbed ceilings, which are typical of Romanesque architecture, alongside the grand, centralized plans and opulent decorations seen in Byzantine buildings. This fusion created unique churches and cathedrals that served as important centers for worship and community life.