who said legitimate power is often called authority
Authority Max Weber, in his sociological and philosophical work, identified and distinguished three types of legitimate domination (Herrschaft in German, which generally means 'domination' or 'rule'), that have sometimes been rendered in English translation as types of authority, because domination isn't seen as a political concept in the first place.[citation needed] Weber defined domination (authority) as the chance of commands being obeyed by a specifiable group of people. Legitimate authority is that which is recognized as legitimate and justified by both the ruler and the ruled.
Oligarchy Oligarchy (from Greek ὀλιγαρχία (oligarkhía); from ὀλίγος (olígos), meaning 'few', and ἄρχω (arkho), meaning 'to rule or to command')[1][2][3] is a form of power structure in which power rests with a small number of people. These people might be distinguished by nobility, wealth, family ties, education or corporate, religious or military control. Such states are often controlled by families who typically pass their influence from one generation to the next, but inheritance is not a necessary condition for the application of this term.