NIGHTBRINGER | The Arthurian Encyclopedia

Goswhit

‘Goose white’
Gooswhite

According to Layamon, the name of Arthur’s helmet. It was made of steel, bound with gold, and adorned with gems.

It had belonged to his father, Uther, and Arthur wore it at the battle against the Saxons at Bath.


Source
Brut | Layamon, late 12th century to mid-13th century