The Spanish scholar Isidore of Seville believed that the name "caliga" derived from the Latin callus ("hard leather"), or else from the fact that the boot was laced or tied on (ligere). Strapwork styles varied from maker to maker and region to region.
Isidore of Seville believed that the term "caliga," which referred to a type of boot, came from Latin callus meaning "hard leather" or due to its lacing system. The style of strapwork varied among different makers and regions.