Yakone

Yakone was an individual who threatened Republic City forty-two years before Avatar Korra's arrival.

History
When Yakone threatened Republic City in 128 ASC, Avatar Aang successfully dealt with him head-on.

Forty-two years later, Councilman Tarrlok brought him up in an argument with Tenzin in order to persuade the United Republic Council to allow his task force to attack Amon head-on, just like Avatar Aang had done all those years ago against Yakone.

Trivia

 * Yakone is a name meaning "Red Aurora" in an Inuit dialect. The language of origin is Ahtna Athabascan, which really isn't Eskimo (Inuit which is up on the north slope versus the Interior tribes of Ahtna). As a metaphor it can mean "blood spray on the snow".