The invention of the "unlimited" dictator

[timelets]

82 BC:

But besides his massacres, the rest of Sulla's proceedings also gave offence. For he proclaimed himself dictator, reviving this particular office after a lapse of a hundred and twenty years. Moreover, an act was passed granting him immunity for all his past acts, and for the future, power of life and death, of confiscation, of colonization, of founding or demolishing cities, and of taking away or bestowing kingdoms at his pleasure. He conducted the sales of confiscated estates in such arrogant and imperious fashion, from the tribunal where he sat, that his gifts excited more odium than his robberies. He bestowed on handsome women, musicians, comic actors, and the lowest of freedmen, the territories of nations and the revenues of cities, and women were married against their will to some of his favourites.

https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Lives/Sulla*.html

Before (202 BC), dictator had a six-month term limit.