The Knights of Castile in the 16th century wore a type of helmet known as a morion, somewhat conical in shape and with an almost sharp crest. It had a wide, raised, and curled brim that ended in a point in front and behind, and the top or crest was curved.
Although the morion was used particularly by infantry or pawns, it was not for this reason that knights and notables stopped wearing it because it was lighter than the helmet and left the face uncovered to breathe more easily.
Popularly associated only with the Spanish tercios of the Golden Age and the Conquerors of America, the morion was used in most European countries in the 16th and 17th centuries.
The morion was a helmet in the shape of a half almond to make the blows slip. In the Spanish tercios he was part of the defensive team of pikemen and arquebusiers. It is currently used by the Vatican Swiss Guard.