A group of countries ruled by one other country is an empire
This is an empire.
protectorate, colony
a group of nations ruled by a single person or government
kingdom= a country,state, or territory ruled by a king or queen, one country ruled by a king, inside an empire empire= several countries ruled by 1 emperor, large group of countries under 1 ruler hope that answers ur question :)
Ireland is independent, so it is not ruled by any other country. Northern Ireland, which is different to Ireland and may be what you are referring to, is part of the United Kingdom.
A group of countries ruled by another country is often referred to as a colony or a territory. This arrangement typically involves one nation exerting control over the political, economic, and social systems of the subordinate countries. Historically, such relationships have occurred through colonization, where the ruling country imposes its governance and culture on the colonized regions. Examples include empires that controlled vast territories across different continents.
Countries are not ruled by other countries. The answer is none, nor does Spain have colonies..
Britain is the only foreign country to have ruled South Africa.
aristocracy
Now they are not similar but previously both were king ruled country
different countries are ruled by different people. some countries are ruled by the queen, king, government and even the military. for example, Zimbabwe is effectivley ruled by the military.