castellum
Noun
Meaning
castellum (plural castella or castellums)
(historical) A small Roman detached fort or fortlet used as a watch tower or signal station.
Examples
The ancient fortified city was known as Ashdod Yam to the Israelites, Azotos Paralios to the Greeks, and Castellum Beroart to the Crusaders.
The word castle is derived from the Latin word castellum, which is a diminutive of the word castrum, meaning "fortified place".
This particular castellum was thought to be located at the Burcht of Leiden, and the city's name was thought to be derived of the Latin name Lugdunum.