Local artists of the time often depicted a priest-king figure, obviously the head of a centralized administration. Even more revolutionary, clay tablets bearing a form of written language had appeared. Symbols were used to list possessions or record business deals and land sales. Susa felt the influence of Sumer, and developed in parallel. The city and its surrounding areas created a separate written language, also recorded on clay tablets. Similarly, a king – like figure begins to appear among relics of Susa from this period. The figure is depicted on engraved cylindrical seals which were used as stamps of ownership, much like signet rings, in both Susa and Mesopotamia. Despite this suggestion of a monarchy, the economy does not appear to have been centralized. Private merchants and traders probably controlled most of the wealth.