Old Irish

Old Irish (sometimes called Old Gaelic) is the name given to the oldest form of the Goidelic languages for which extensive written texts are extant. It was used from the 6th to the 10th centuries, by which time it had developed into Middle Irish. Old Irish is thus the ancestor of Modern Irish, Scottish Gaelic, and Manx. Broadly speaking, the grammar and sound systems of the modern languages are simpler than those of Old Irish.