Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Historic Centre of Brugge' has mentioned 'Fortifications' in the following places:
Occurrence Sentence Text Source
In the Bruges area, the first fortifications were built after Julius Caesar's conquest of the Menapii in the first century BC, to protect the coastal area against pirates.
The Viking incursions of the ninth century prompted Count Baldwin I of Flanders to reinforce the Roman fortifications; trade soon resumed with England and Scandinavia.