At the centre of power, the kings employed a succession of clergy as chancellors, responsible for running the royal chancery, while the "familia regis", the military household, emerged to act as a bodyguard and military staff. England's bishops continued to form an important part in local administration, alongside the nobility. Henry I and Henry II both implemented significant legal reforms, extending and widening the scope of centralised, royal law; by the 1180s, the basis for the future English common law had largely been established, with a standing law court in Westminster—an early Common Bench—and travelling judges conducting eyres around the country. King John extended the royal role in delivering justice, and the extent of appropriate royal intervention was one of the issues addressed in the "Magna Carta" of 1215. The emerging legal system reinvigorated the institution of serfdom in the 13th century by drawing an increasingly sharp distinction between freemen and villeins.