How and why was parliament created?
In it, the interests of the greatest possible number of citizens should be represented. They all can vote for individuals who represent them in Parliament.
It is a principle of democracy that Parliament should represent the interests of the largest possible number of citizens. This is why elections have to take place under very stringent and detailed rules.
How did the English Parliament develop and gain more power overtime?
It could raise armies to declare war on the king. The Parliament of England was the legislature of the Kingdom of England. In 1066, William of Normandy introduced the feudal system, by which he sought the advice of a council of tenants-in-chief and ecclesiastics before making laws. In 1215, the tenants-in-chief secured Magna Carta from King John, which established that the king may not levy or collect any taxes.