Which group was at the bottom of medieval hierarchy

A period of history between the ancient period and the modern, spanning roughly from 476CE to 1492CE. A simple model used to represent the social structure of the Middle Ages. In this system, there exists a strict hierarchy, with the King at the top and peasants at the bottom.

peasants, we know this because they were hated

example:

Many peasants disliked trial by jury, as they feared that it fostered feelings of revenge among their neighbors and fellow villagers. The brutality of the medieval system of law and order succeeded in preventing many large-scale uprisings. ... Many peasants were forced to work a few days every week on church land for free.

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others  

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.