Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Castles and Town Walls of King Edward in Gwynedd' has mentioned 'Middle Ages' in the following places:
Occurrence Sentence Text Source
[134] In the opinion of military historian Allen Brown, Caernarfon was "one of the most formidable concentrations of fire-power to be found in the Middle Ages".
Criterion (iii): The royal castles of the ancient principality of Gwynedd bear a unique testimony to construction in the Middle Ages in so far as this royal commission is fully documented.