Who established Ireland?

Ireland was not formally established by a single individual or entity. The history of Ireland dates back thousands of years, with various groups inhabiting the island throughout time. The earliest known inhabitants of Ireland were hunter-gatherers who arrived during the Mesolithic period around 8000 BC. Subsequently, Neolithic farmers came to the island around 4000 BC, bringing agriculture and new technologies. The Celtic people arrived in Ireland during the Iron Age, and their culture and traditions became dominant. The political landscape consisted of numerous small kingdoms and chiefdoms until the High Middle Ages, when the island came under the control of Anglo-Norman invaders. This marked the beginning of the establishment of English rule in Ireland, which lasted for several centuries.