Who created the fictional nation with a royal family which Doomwar has to deal  with their  covert overthrow?
Doomwar:  It deals with Doctor Doom's covert overthrow of the royal family of Wakanda and the following clash with various members of the superhuman community. Wakanda (comics):  Wakanda first appeared in "Fantastic Four" #52 (July 1966), and was created by Stan Lee and Jack Kirby.
Stan Lee and Jack Kirby