I just returned from a wonderful trip to Wales. On the way, I arranged to visit Temple Church in London, a place I have been trying to get to for many years. It was well worth it.
Put aside all the silliness you have heard about the Templar Knights, even Monty Python. They were deadly serious. And for all the blood and error, they were searching for and attempting to establish a concept. It was in the round church quartered by the Cross. Temple Church is in a circle based on the Church of the Holy Sepulcher in Jerusalem. The site of the Resurrection of Jesus was considered to be the center of the earth to the medieval Christian mind. Everything radiated from there.
In 1215, powerful Barons in England threatened King John with the loss of his life and kingdom with some very good reasons. And with no candidate at the time to replace him as king, the Baron's came up with concepts instead. The most important being: No. One. Is. Above. The. Law. And they made John sign a Charter to that effect with 25 of them as guarantors to remove the king if he failed to live up to the Charter. Well, fail he did as did many kings that followed. But the principles were enshrined as the faults of the Charter slowly worked themselves out over the centuries. This is an ongoing process.