Did anyone else (Dragon, pirates or marines) know about Imu before Sabo said "hi dude"

[Warmmedown]

Before Imu ovelry aggressively high-fived Sabo (shit, my bad! No, don't run away!), did Sabo know Imu existed? Or did he get surprised there was someone above the Gorosei?
Did Dragon, Ivankov and Kuma know?
Did Neferitou know? Imu had a portrait of Vivi's ancestor (she better not look exactly like Vivi. Vivi's mother already looks quite a lot like Vivi and the ancestor is probably on her dad's side. Though, her maternal and paternal side could easily be related, seeing as they're all from one small island and they're royals, plus they're based on Egypt. But maybe it wasn't an island back then, depending on the world's history).


Did Shanks, Doflamingo, Vegapunk, Sengoku, Garp, Tsuru, Aokiji, Akainu, Kizaru, Fujitora, Green Bull, Blackbeard, Big Mom, Kaidou know? Does Carlos the Celestial Dragon know? Did Roger, Rayleigh, Whitebeard, Rocks and Shiki know?

 

[SSJ2]

No. Sabo calls back to the revolutionary army and everyone is shocked to hear about Imu.

Cobra was also shocked when he saw Imu sit on the empty throne. Roger and Rayleigh and some of the older legends might know, assuming the poneglyphs tell the story of the ancient kingdom. They might have messages about Imu's existence.

 

[Future Warrior]

Dragon has gotten to be a pretty lackluster character in recent years. He seemed like someone who knew a lot of things we didn’t, with major confidence in whatever plans he had brewing. That’s not been the case anymore.

 

[SSJ2]

Man I just reread post CP9 when Garp meets the Straw Hats. Dragon is introduced as Luffy's dad and the reaction was insane. And since that time he's done absolute fuck all.

 

[sei'taer]

Dragon has caused enough issues with the world Government that they destroyed an entire island. They've effectively laid complete siege to the Celestial Dragons cutting them off from the rest of the world.

The revolutionary army has done a lot in One Piece.