English common law developed from?

The English common law originated in the early Middle Ages in the King’s Court (Curia Regis), a single royal court set up for most of the country at Westminster, near London. Like many other early legal systems, it did not originally consist of substantive rights but rather of procedural remedies. The working out of these remedies has, over time, produced the modern system in which rights are seen as primary over procedure. Until the late 19th century, English common law continued to be developed primarily by judges rather than legislators.

Independent executive agencies are more specialised.