The subsidiary titles held by the Earl of Erroll are: ''Lord Hay'' (created 1449) and ''Lord Slains'' (1452), both in the Peerage of Scotland. The Earls of Erroll also hold the hereditary office of Lord High Constable Of Scotland . The office was once associated with great power.
The Earl of Erroll is one of thee peers entitled to appoint a private Pursuivant , with the title "Slains".
