 In 1629, George Apafi, an itinerant Hungarian aristocrat, noted that tax increases had "depleted the country", pushing taxpayers into hiding or exile, to the point where even horses had become a scarce commodity.His travel account is also the first source mentioning a multitude of derelicts, or "calici", living on the outskirts of Bucharest.Leon also enforced the treatment of serfs as immovable assets on the land they labored, explicitly confirming rules set under Michael the Brave.