Nothing like reviving an old thread. Anyway I was wondering what the rules about coats of arms are if they are no longer used. ie. I'm of Clan Keith. The associated coat of arms that is pictured previously in this thread actually belonged to the the Earl Marischal of Scotland. The last known person to hold this title was George Keith (1693-1778). He had a brother whom I cannot find any information on, and a sister who married another Lord, but George Keith had no direct decendents as far as I know. What are the rules for a coat of arms then?