Nobles
Concept · Stellaris 4.5.2
Nobles in the Stellaris encyclopedia: Nobles turn Consumer Goods into Unity, Amenities and Stability.
Nobles in the game's words
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Nobles turn Consumer Goods into Unity, 
Amenities and Stability.
Heavy is the burden of the nobility, whose birthright is to rule over their unwashed lessers. Luckily, there are a few financial advantages to the position.
Source: common/game_concepts (concept_noble) and localisation/english, Stellaris Cygnus v4.5.2 (9776).