 Thus, from the 960s, more and more professional regiments, both from the old "tagmata" and newly raised formations, were stationed along the border.To command them as well as coordinate the forces of the small frontier themes, a number of large regional commands ("ducates" or "catepanates"), under a "doux" or "katepano", were set up.In the East, the three original such commands, set up by John Tzimiskes, were those of the "doukes" of Antioch, Chaldia and Mesopotamia.