Casamari Abbey is a Cistercian abbey in the Province of Frosinone, Lazio, Italy, about 10 kilometers east-south-east of Veroli.

Gothic architecture appeared in the prosperous independent city-states of Italy in the 12th century, at the same time as it appeared in Northern Europe. In fact, unlike in other regions of Europe, it did not replace Romanesque architecture, and Italian architects were not very influenced by it. However, each city developed its own particular variations of the style.