In the 9th century Feudalism became the foundation whereupon society was build in Europe. The country was divided in feudal estates or fiefs and at the head of a fief was a lord who swore loyalty to the king, his liege, and thus became his vassal. In return the king granted him the government of that fief, that was called Investiture. It was ceremonially symbolized by a clod of soil on top of forest branches.
Você já usou muitas vezes os números, mas será que já parou para pensar sobre: O modo como surgiram os números? Como foram as primeiras formas de contagem? Como os números foram criados, ou, será que eles sempre existiram?