These figures are based on the comics by Harold Foster. In Germany called Prinz Eisenherz.
You can still buy the comics, but especially in the late 50’s they were very popular. Historically the comics are not very correct. Late medieval knights fight against Romans, Huns and Vikings. Anyone who reads the comics of prince Valliant will find different Elastolin figures. Not only the prince and his friends but also Huns and Vikings.