Kenneth H. Jackson
Kenneth Hurlstone Jackson (1 November 1909 – 20 February 1991) was an English linguist and a translator who specialised in the Celtic languages, described by Roland Blenner-Hassett as "one of the ablest and most productive Celticists of our time". He argued that text of the Ulster Cycle of tales, written circa AD 1100, preserved an oral tradition originating some six centuries earlier and reflects Celtic Irish society of the third and fourth century AD. His Celtic Miscellany is a popular standard, while his Language and History in Early Britain became the standard account of the early history of the Brittonic languages.