Yay! Mairi may have met him at court, however briefly, upon one of her rare visits to England (she does make them on occasion - her duty as Queen). Cormac may not know him - Ireland and Wales, and different worlds, etc - but if you have any ideas on linking them, I'm totally open!
Penelope, my lovely little spy, occupies herself more with the England/Ireland/Scotland side of things and Wales isn't of a big concern to her - yet - unless of course the Potters decide it should be her concern ;) If you have any plottage for her, let me know!