galloglass /ˈɡalə(ʊ)ɡlɑːs
/ (also gallowglass) ▸ noun historical (in Ireland) a mercenary or member of a special class of soldiers in the service of a chieftain. – ORIGIN late 15th century: from Irish gallóglach, from gall ‘foreigner’ and óglach ‘youth, servant, warrior’.