Following Robert William Billings's "Baronial and Ecclesiastical Antiquities of Scotland", architectural historians identified the stylistic features characteristic of the baronial castles built from the latter 16th century as Scots Baronial style, which as a revived idiom architects continued to employ up until 1930s. Scottish baronial was core influence on Charles Rennie Mackintoshs Modern Style architecture. The style was considered a British national idiom emblematic of Scotland, and was widely used for public buildings, country houses, residences and follies throughout the British Empire. The Scottish National War Memorial was the last significant monument of the Baronial style, built 1920 in Edinburgh Castle after World War I.