James's career extended beyond technical design. He served as constable of Harlech from 1290 to 1293, making him the king's representative inside a fortress he had helped shape. The office implied trust in his ability to manage and, if necessary, fight the castle. Edward summoned him to Scotland in 1298, and the record places him at Stirling during the 1304 siege. Design, garrison responsibility, and campaign fortification were connected parts of his royal service.
Notable Point · 10:36-12:10
Castle builder as royal military officer
James designed castles, held Harlech as constable, and supported Edward's Scottish campaigns.