Finally, another part of the Aran Islands’ identity comes from being a Gaeltacht. Although Oliver Cromwell did arrive on the islands during his conquest of Ireland in the mid-17th century and set up a defensive fort there, he eventually left with his troops. The population of the islands increased afterwards, as some people from the mainland moved to the Aran Islands to escape the reach of the English. Because inhabitants were ultimately less harried by the colonizers, the Irish language was able to persist. Today, Irish remains the first language of the islands.