The English, and later, British states practised cultural genocide form an early date in Ireland.
This included:
Seizing land, by conquest and settlement of their own citizens on land previously occupied by the indigenous people

Outlawing the religion, language, dress, music and customs of the indigenous people

Introdusing laws to specifically prevent those practising the religion of the majority of the indigenous people from inheriting land or property or from entering higher education.

Introducing National Schools to anglicise the indigenous population - a typical result in the 19th/early 20th centuries was that grandchildren could no longer speak the same language as their grandparents, which led to many old folk tales and songs being lost - and, overall, resulting in a deep-rooted lack of cultural confidence which has only recently started to lift.
Thanks lads!