Hi ColinE - I wasn't taking the mick, just posting before thinking.
Isn't there a "firth of fourth" etc and roman numerals v and i etc adds up to diddly squat. sorry.
all the best.
Dairybox.
Could it be "Cromba or Cromarty".
Studying the map, I see Cromba is an alternative name for Cromarty.
Feel like I'm scraping the barrel now.
Best Wishes,
Colin