In Travian Kingdoms, there are several situations where conquering a village is not possible. Below is a comprehensive list of all such scenarios along with their explanations:
Village Status and Restrictions
It is the defender’s only village: The last village of a player cannot be conquered.
It is the main village (capital): The capital village cannot be conquered under any circumstances.
There is a World Wonder in the village: A village containing a World Wonder cannot be conquered until the Wonder has been destroyed.
There is a Residence or Palace in the village: A village with an active Residence or Palace must have the building destroyed before it can be conquered.
Culture Points and Expansion Slots
The attacker needs have both sufficient culture points and an available expansion slot to found or conquer a village.
In order to chief a city two (2) culture point slots are required. A village only requires one (1) culture point slot.
Regardless of if conquering a village or city it only requires one expansion slot.
Raid instead of normal attack
Troops raided the village: Loyalty cannot be reduced during a raid. Only normal attacks by a senator/chief can lower loyalty.
Kingdom and Diplomacy Rules
Attacker and defender are in the same kingdom: Villages from players in the same kingdom cannot be conquered.
Defender is in a confederated kingdom: You cannot conquer villages from allied kingdoms.
A confederation was canceled within the last 2 days: If both kingdoms were part of a confederation that ended within the last 48 hours, villages still cannot be conquered.
The attacker or defender was in the same kingdom recently: If either player left the other’s kingdom within the last 3 days, conquest is temporarily disabled.
The attacker or defender was in a confederated kingdom recently: Conquest is not allowed if there was a confederation relationship between the kingdoms (or their allies) that ended within the last 3 days.
Protected Villages
The village belongs to a foreign or independent governor in the attacker’s territory: Such villages are under temporary protection and cannot be conquered if they are inside the attacker's kingdom or were there in the last 3 days.
The village was inside the attacker’s kingdom borders within the last 3 days: Protection rules still apply for a short duration even after a village leaves kingdom territory.
Sitter
The attacker acted as a sitter for the defender in the last 7 days: If the attacker has recently used the sitter function for the defender, they are not allowed to conquer the defender's village to prevent abuse.