Nobody set out to create Parliament. It developed naturally out of the daily political needs of the English King and his government. Nor did it develop continuously over time, but went through short periods of rapid growth.
Yet despite its unintentional and haphazard development, the modern British Parliament is one of the oldest continuous representative assemblies in the world. How did this happen? It is a story that involves revolt, war, invasion, several dethronings, and even Henry VIII's love life.