In the absence of real ways of assessing authenticity, relic-collectors became prey to the unscrupulous, and some extremely high prices were paid. Forgeries proliferated from the very beginning. Augustine already denounced impostors who wandered around disguised as monks, making a profit from the sale of spurious relics. In his "Admonitio Generalis" of 789, Charlemagne ordered that "the false names of martyrs and the uncertain memorials of saints should not be venerated". The Fourth Lateran Council (1215) of the Catholic Church condemned abuses such as counterfeit relics and exaggerated claims.