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
RacŁAw	RAHTS-wahf	Polish
Turin	-	Literature
Lycus	-	Greek Mythology (Latinized), Ancient Greek (Latinized)
Dick	[dik]
Leonidas	-	Greek, Ancient Greek
Dunyasha	-	Russian