1470's -Quote from website
How old is Auchindrain? Perhaps thousands of years.
The oldest written evidence is a legal document from the 1470's which refers to Achadh an Droighinn — The Field of the Thorn Trees — as a going concern.

from http://auchindrain.maripo.com/ which was compiled by Ted Lollis who did a vast amount of work on reviewing and researching around the township, particularly the Campbells.

Unfortunately the original source for this assertion is not available.
Something to keep looking for.

1474 Inveraray created Burgh of Barony by James III