His atlas "The Theatre of the Empire of Great Britaine" was published in 1611 and 1612, and contained the first set of individual county maps of England and Wales besides maps of Ireland and a general map of Scotland. Tacked onto these maps was an introduction at the beginning when he addressed his "well affected and favourable reader", which had numerous Christian and religious undertones, admitting that there may be errors, but he made it the best he could, and stated his purpose for the atlas: