On land, evidence confirming the use of this flag appears in the depiction of Edinburgh Castle by John Slezer, in his series of engravings entitled "Theatrum Scotiae", c. 1693. Appearing in later editions of "Theatrum Scotiae", the "North East View of Edinburgh Castle" engraving depicts the "Scotch" (to use the appropriate adjective of that period) version of the Union Flag flying from the Palace block of the Castle. On the "North Prospect of the City of Edenburgh" engraving, the flag is indistinct.