1) BBC television drama 2) Scandinavian Scotland 
The gallowglasses (also spelt galloglass, gallowglas or galloglas; from gallóglaigh meaning foreign warriors) were a class of elite mercenary warriors who were principally members of the Norse-Gaelic clans of Scotland between the mid 13th century and late 16th century. As Scots, they were Gaels and shared a common background and language with the...
• (n.) A heavy-armed foot soldier from Ireland and the Western Isles in the time of Edward /
Gal'low·glass` noun [ Ir. galloglach . Confer Gillie .] A heavy-armed foot soldier from Ireland and the Western Isles in the time of Edward ... Shak.