Hello everyone
I've undertaken a task and beginng to wonder about my sanity

I am trying to find the name of, and more information, the last living, recognized by the Court of the Lord Lyon, chief of the clan Muir.
Names, birth location and date, death location and date, relatives, etc etc
So far I've read heresay that he died around 1700.
Anyone have information on this?
Suggestions on where to start this search?
I'm in the US and won't be heading to Scotland anytime over the next three years. Drats!
Kind regards,
See