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
Saif	-	Arabic
Zurab	-	Georgian
Iovis	-	Roman Mythology
Modesto	mo-DHE-sto (Spanish, Italian)	Spanish, Italian, Portuguese
SelÂHattİN	-	Turkish
Bayani	-	Tagalog