The core fortified area of a town or city is known as a citadel.
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Citadel - Simple English Wikipedia, the free encyclopedia
ANTIQUE MAP SIEGE PLAN OF CITADEL TURIN by AUST'S 1799 PUBLISHED GARDINER 1812
What is a Citadel? (with picture)
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My map of the city Oakhurst from The Sunless Citadel adventure module [OC] : r/DnD