There was once a castle of Auchtergaven which was the seat of the barony of the same name, although nothing of it survives and its exact location has been lost.
In February 1528 or 1529 John Ross of Ochtergawin sold to his son, James Ross, the lands of le Manys de Ochtergawin with the manor and third part of its mill, and the east half of Prestoun, in the barony of Ochtergawin.
A substantial tower named Ochtyrgem is marked on Pont’s late 16th century map, to the south of the church of Ochtyrgem, to the north-east of Ardonochy and to the north of a burn which runs from Airntilly to the Garry Burn.
I have placed the site of the castle in a field to the north of Ardonachie pending further research.
Alternative names for Auchtergaven
Auchtergavin; Auchtergawin; Auchtergevin; Huchtirganer; le Manys de Ochtergawin; lie Manis de Ouchtergavin; lie Maynis de Ochtergawin; Mains of Auchtergaven; Manis de Ochtergavin; Ochtergane; Ochtergavin; Ochtergawin; Ochtergevin; Ochtirgane; Ochtirgavin; Ochtyrgem; Oghtergeven; Ouchtergavin; Ouchtergawin