Heerschild

The Heerschild (clipeus militaris), also called the shield of knighthood, in the Early Middle Ages was the right to raise a feudal levy of troops. The call to do so was the Heerbann. The resulting importance of a system of military ranks, based on the ability to provide men for a campaign, became modified in the law books published in the 13th cen...
Found on http://en.wikipedia.org/wiki/Heerschild

Heerschild

(from the article `Europe, history of`) ...that great men assumed them only with reluctance. It was correspondingly rare for a man to be the vassal of more than one lord; hence, a hierarchy ...
Found on http://www.britannica.com/eb/a-z/h/31
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