A. Sutherland – AncientPages.com – Ogham is very old writing of which the earliest examples date back to 2200 BC. The language of the inscriptions is Irish, but many inscriptions were found to have additional equivalents in Roman and Latin; inscriptions in Scotland used the Ogham script with Old Norse or Pictish.
Carving of Ogham letters into a stone pillar – illustration by Stephen Reid (1873 – 1948), in: Myths & Legends of the Celtic Race by T. W. Rolleston (1857 – 1920), published 1911, p. 288. source
About 360 ogham stones have been recorded in Ireland (in Munster, Kerry, Cork, and Waterford) and with those found in Britain, the total number is more than 400. The ogham stones located in Scotland, Wales, and the Isle of Man are all linked to the Irish settlements that existed during the decline of the Roman Empire.