The article presents the analysis of the first Royal diary in Western Europe by Edward VI of England (1547-1553). The article describes the content of the source, it's genre features. Features of the author's style are also analyzed. The article also has the analysis of the groups of notes on different social, political and religious aspects of the life on British Isles that were important during the lifetime of the author. Events that are described by Edward VI are analyzed on the basis of historical and ideological context of the era. The article describes the features of manifestation of the author's personality on the pages of the diary. Source base for the article is the Royal diary, epistolary heritage of the contemporaries, materials of the commissions and acts of the Parliament.