In the 7th century, seventy lines of text were created to record the number of men in western Scotland for the purpose of military service and tax collection. The Senchus fer nAlban (History of the men of Scotland) includes resources for the population of Dál Riata, the Kingdom of the Gaels on the west coast of Scotland. (photos)
While written in the 7th century, the earliest known copy of the document was made in the 14th century. It is owned by Trinity College, Dublin.