In medieval Italy and the Papal States, a royal or noble official who managed estates, enforced the law, or collected taxes in a region.
From Lombard 'gastald,' derived from Germanic 'gastald,' composed of 'gast' (guest/stranger) and 'wald' (to rule). Over time, it came to mean a manager or steward with significant administrative power.
The 'gast' part literally meant 'guest' or 'stranger,' so a gastaldo was originally someone trusted enough to manage property for an absent nobleman—basically a professional outsider hired to keep things fair because he had no local loyalties.
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