Parliamentary democracy as we have it in the 21st century was a gradual development over many hundreds of years from the time of absolute sovereign power to the present situation where the sovereign gives her assent to decrees already decided. A.V. Dicey has described parliamentary sovereignty as:-
Such a state could be described as a natural development according to the needs of the sovereign and the people at various times through history. Its ancestor is the Anglo-Saxon Witan. At that time this only met when the king wanted it to in order to discuss various matters. Only those he personally invited would attend as described on the web page of the United Kingdom parliament under the heading Birth of the English Parliament.2 The Witan gave advice, but the king did not necessarily have to take it. It did not devise laws, but enabled the laws devised by the king to be enacted. In balance the king knew that he needed powerful support and money obtained by taxation, so wanted these men on his side. In Norman times the kings had advisers, but also called together the Great Council, the precursor of the present House of Lords. Also each county had a meeting or moot with representatives sent from each village. Later known as the County Court this introduced the idea of local people with local representation. These two would later come together as Parliament ( a place to speak) – the House of Lords and the House of Commons, although the term was first used in 1236 to describe a meeting between the king and his nobles and prelates.
In the seventh century Charles Ist believed in the God given right of kings to rule as he wanted, but this caused tension with parliament. The politicians passed a law forbidding the king to raise taxes without their permission – something they were not prepared to do. The Civil War ensued.3