Galloglass, from the Gaelic gall_glaigh for 'young foreign warriors', were mercenaries from the Western Isles of Scotland who fought in the retinues of Irish magnates from the mid-13th century until the early 17th century. Without question, galloglass are among the most visually impressive warriors of all time: they were sketched by Albrecht D_rer, were mentioned by Shakespeare, and were discussed with awe and amazement in the correspondence of all the leading Elizabethan soldiers who served in Ireland. Thousands fought in Ireland, and yet so far there has been only one detailed account of the galloglass, and this work concentrates on the clan and family structures of the galloglass, and not their experience as warriors. This book provides the first detailed military history of these fearsome warriors.