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This small mountain village takes its name from the settlement of Roman Marruvio which in Latin means ‘rock’ or ‘heap of stones‘.

Like many towns in the area, during the Middle Ages the people took refuge in the hills to escape the Barbarian invasions and formed their village around a fortified castle protected by some nobles. So Morro has been under the protection of the Abbey of Farfa until the twelfth century (1101), when it passed to the Municipality of Rieti and then to the Holy See.

The ancient village still has the plan with houses arranged in concentric circles around the castle.