What is the Loyalty of a village?
Loyalty shows how close a village is to switching owners. Usually it's 100 and in that case it's not shown in Village overview. As soon as there's an attack with a nobleman, the loyalty drops between 20-35 with every attack. There are more buffs to help a nobleman reduce loyalty faster, such as Noble booster and Paladin's skill Persuasion. Loyalty usually rises by 1 point per hour, but this is dependent on the speed of the world. For example, on a speed 2 world the loyalty will rise by 2 points per hour.
As soon as loyalty drops to 0 or below 0, village is conquered by the attacker and loyalty increased to 25.