parvenu
(en)
(noun) one that has recently or suddenly risen to an unaccustomed position of wealth or power and has not yet gained the prestige, dignity, or manner associated with it
Recognizing this, he invariably suffered an involuntary twinge of vainglory, the almost haughty yet well-concealed manners of a parvenu treated as an equal by princes and princesses
notable
4 days, 22 hours ago