A Grant of Arms by Philip II of Spain to Alonso de Mesa and Hernando de Mesa, signed 25 November 1566. In Spanish heraldry, coats of arms were granted based almost entirely on military service, which made it possible for commoners to join the ranks of the Spanish nobility. Also unique to Spain was that titles could be inherited through females and via illegitimacy.Image: Royal Household of Spain; Restoration: Lise Broer