An invasion, a young western king, the birth and fall of a mega city.

"An invasion, a young western king, the birth and fall of a mega city."

This doesn't describe a plot. It seems to list a few events in a story. It seems like this invasion is the inciting incident, so what does this king have to do in result of that? The last part may be a part of the script, but it is likely it has no place in the logline, but I can't really give my opinion on that bit until I have more information, a clear plot, a clear object goal.