castellated abbeys is not in our dictionary (yet). Here's what it could mean:

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noun

Monastic or conventual complexes that have been constructed or modified with defensive architectural features typical of castles, such as battlements, towers, and fortified walls.

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During the turbulent medieval period, many monastic communities built castellated abbeys to protect their inhabitants and treasures from raids.

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The ruins on the hill were a prime example of a castellated abbey, with its high, fortified walls surrounding what was once a place of worship.

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