1) Ancient Celtic tongue 2) Ancient Gaelic tongue 3) Celtic language 4) Cousin of erse 5) Pre-1000 Celtic language 
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 c. AD 600–900. The primary contemporary texts are dated c. AD 700–850; by AD 900 the language had already transitioned into early Middle Irish. Some Old Irish texts date from the ...
[n] - Irish Gaelic up to about 1100
noun Irish Gaelic up to about 1100