How Far Back Do We Have Evidence of Clan Organization?

Some clans trace their name andane back a long way. The house of mc alpin is supposed to have unified scotland ind eight forty three. And the mc kinnons and mac gregors claim descent from mc alpin. But in terms of organization, once again, the journey were travelling is is a journey from an organization which is a kinship and loosely territorial base,. but lot, a lot around kindred, to one which is more like a conventional feudal lordship.