Lord of Banners
Sergeant at Arms
Notables can change who they support, but it's pretty rare that it happens. If a notable is not currently supporting a clan, then it goes down the list of all clans with which they have > 50 relations. For each of these clans there is an RNG roll that happens once per day. The roll is a decimal between 0 and 1 and must be less than the result of the following equation to succeed:
(relation - 50) / 2000
Even if you have 100 relations with a notable, it still only gives you a 2.5% chance per day that they will support you.
Notables will flat out stop supporting a clan if they fall below 0 relations with them. When they are < 25 relations with their currently supported clan they have a chance to stop supporting the clan based on the equation:
(25 - relation) / 500
So for instance, if the clan has a relation of 24, then they only have a 0.2% chance of losing the notables support per day (5% at 0 relations). Technically, the player does have a low chance of gaining the support of a notable with the mechanic as currently implemented, but it's very rare.
I think all of the notable related stuff is still a work in progress, so I wouldn't expect things to remain as they are permanently.
Nevermind found your answer! lol you're on fire for sure.
Edit: Just adding on this. It would be awesome to have other ways to get relations with notables other than quests. If anyone can think of other ways or knows of any good ways I'm going to try getting some notable relations to 100 in settlements surrounding my villages. Would appreciate any advice because normally I just do quests.