Gallowglass

Gal′low-glassˊ

,

Noun.

[Ir.

galloglach

. Cf.

.]

A heavy-armed foot soldier from Ireland and the Western Isles in the time of Edward [GREEK]

Shak.

,

Noun.

An ancient Irish foot soldier.

gallowglass ‎(plural gallowglass or gallowglasses)

A mercenary warrior élite among Gaelic-Norse clans residing in the Western Isles of Scotland and Scottish Highlands from the mid 13th century to the end of the 16th century.
- ~1603, William Shakespeare, Macbeth, Act I, scene I:
  The multiplying villanies of nature / Do swarm upon him--from the western isles/ Of kerns and gallowglasses is supplied.