Chartres Cathedral was rebuilt after a fire in 1194 by an unknown architect. The architect rebuilt the Cathedral into a cross that could be seen from Heaven making it the cutting edge of its day that Bishop Renoux wanted. The architect uses geometry of the square, circle and equilateral triangular which was common during the mid-evil times to design this magnificent cathedral.
This youtube video describes about the different kinds of magistrates that could be appointed in the Roman government. It also covers some other key things about the government of ancient Rome.