Poul Anderson's Captain flandry page 56 the subject of the claim only ten percent of population born to be leaders or creators.

[Sable]

On page 56 the chracter karlsarm says to the chracter john ridenour that only ten percent of the population is born to lead or have artistic capacity.

the people of karlsarm are said to total twenty million on one continent. fifteen million was estimate before columbus landed in 1492 in north america.

so twice that number .