A Roman dictator was an extraordinary magistrate in the Roman Republic endowed with full authority to resolve some specific problem to which he had been assigned.- Roman dictator
Dictators had more "major powers" than any other magistrate, and after the Dictator was the censor, and then the consul, and then the praetor, and then the curule aedile, and then the quaestor.- Roman magistrate
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The senatus consultum ultimum ("final decree of the senate", often abbreviated to SCU) is the modern term given to resolutions of the Roman senate lending its moral support for magistrates to use the full extent of their powers and ignore the laws to safeguard the state.
Its usage in the late republic also was in contrast to the general practice of the early republic to appoint dictators to resolve domestic unrest.