an éminence grise

(formal)

someone who has a lot of power and influence but no official position Although he never became a minister, he was the party's éminence grise for 15 years.

Common Names:

Name	Pronounced	Usage
Fabian	FAH-bee-ahn (German, Dutch), FAH-byahn (Polish), FAY-bee-ən (English)	German, Dutch, Polish, History
Gavriila	-	Russian
Clover	KLO-vər	English (Rare)
Osvaldo	-	Spanish, Italian, Portuguese
Porntip	-	Thai
Bahadir	-	Turkish