Old Irish refers to the language and culture of the Celtic people who lived in Ireland before the arrival of the English. The term 'Old Irish' is used to describe the language spoken by these people, which is also known as 'GAELIC' or 'ERSE'. The CELTS were a group of people who lived in Europe during the Iron Age and were known for their art, music, and literature. The ERSE language is still spoken today in some parts of Ireland and Scotland.