An extensive building and rebuilding of royal palaces probably began under James III (r. 1460–88) and accelerated under James IV, reaching its peak under James V (r. 1513–42). They used exceptional one-off revenues, such as the forfeiture of key lands, to establish their power across their kingdom in various ways including constructing grander castles by extending and modifying existing fortifications. These works have been seen as directly reflecting the influence of Renaissance styles. Linlithgow was first constructed under James I, under the direction of master of work John de Waltoun and was referred to as a palace, apparently the first use of this term in the country, from 1429. This was extended under James III and began to correspond to a fashionable quadrangular, corner-towered Italian signorial palace of a "palatium ad moden castri" (a castle-style palace), combining classical symmetry with neo-chivalric imagery and using harling to give them a clean, Italian appearance. There is evidence of Italian masons working for James IV, in whose reign Linlithgow was completed and other palaces were rebuilt with Italianate proportions. According to architectural historian John Dunbar, the results were the "earliest examples of coherent Renaissance design in Britain".