Matthew Paris's map of 1247 shows a clear north–south divide to Scotland. Proverbially
Stirling is the strategically important "Gateway to the Highlands". It has been said that "Stirling, like a huge
brooch clasps
Highlands and
Lowlands together". There is also and east–west divide as told in the story as recorded by
Boece who relates that in 855 Scotland was invaded by two
Northumbrian princes,
Osbrecht and
Ella. They united their Northumberian Anglian forces with the Lowland Strathclyde Britons in order to defeat the Highland Pictish Scots. Having secured Stirling castle, they built the first stone bridge over the Forth. On the top they reportedly raised a crucifix with the inscription: "Anglos, a Scotis separat, crux ista remotis; Arma hic stant Bruti; stant Scoti hac sub cruce tuti." It may be the stone cross was a
tripoint for the three kingdom's borders or
marches. In this way the stone cross in the centre of Stirling Bridge was the heart of Scotland. ==Central Belt and Watershed==