The Magna Carta which was singed by King John of England on June 15, 1215 is a historical and landmark document that established modern democratic values. Through this document, the idea 'government can only do what the people allow it to accomplish' developed and shaped how governments function and use thier powers in a democratic state.
This concept is also called as 'popular sovereignity or consent of the people'. Its basic principle states that the power and authority of a state/government can only be created and exercised if the people consent to it. Without the people's consent, the government cannot exercise any sovereignity or authority in any way.
The speaker wants equal rights for Negros. Negro soldiers saved democracy in France and he wants the same rights (voting, de-segregation...) in their own country.
In the feudal system Knights worked for Nobels, who worked for the King. So Knights were below them but still above Merchants and Peasants. Knights were often equals to vassals.
