For much of the 20th century, the castles and walls were considered primarily from a military perspective. Their use of concentric defences, barbicans and substantial gatehouses led D. J. Cathcart King to describe them as the "zenith of English castle-building", and Sidney Toy to assess them as "some of the most powerful castles of any age or country".; In the late 20th and 21st centuries, historians such as Michael Prestwich and Abigail Wheatley also highlighted the sites' roles as palaces and symbols of royal power. The location of castles such as Caernarfon and Conwy were chosen for their political significance as well as military functions, being built on top of sites belonging to the Welsh princes. The castles incorporated luxury apartments and gardens, with the intention of supporting large royal courts in splendour. Caernarfon's castle and town walls incorporated expensive stonework, probably intended to evoke images of Arthurian or Roman imperial power in order to bolster Edward's personal prestige. The precise role of the royal architect James of St George in the construction projects, and the influence of his native County of Savoy on the designs, also continues to be debated by academics. However the primary sources do indicate he played a key role, describing him as “Magistro Jacobo de sancto Georgio, Magistro operacionum Regis in Wallia” or “Master James of Saint George, Master of the King’s Works in Wales.”TNA 372/131/26
