Rationalis
The rationalism was a kind of Minister of Finance in the Roman Empire.
Task
This minister had the task to manage all property taxes and seek. He was also responsible for monetary stability, for the mines and the Münzprägungsstätten. He worked closely with rationibus together, an accountant, the protocol resulted. The Office of rationalism and the rationibus was clothed by freedmen slaves, as they were less corrupt, according to the Kaiser.
History
The Office of the rationalism gave it to the time of the reforms of the emperor Diocletian. Then, these tasks have been replaced by a sacrarum largitionum comes at the end of the 3rd century AD.