User blog comment:NickFusi0n/A Theory on The Coordinate and The Wall Titans/@comment-200.83.222.106-20140611030035

I believe that the walls titans are in fact ancient titan shifters, perhaps they were forced to " made the walls" using the coordinate, i think that the first titan shifters fought against the titans with the humanity, but they were betrayed. the monarchy (reiss family, perhaps also titan shifters) made the walls with the coordinate and forced the others shifters to live out the walls (with the control of the coordinate). The shifters survive and want revenge, meanwhile grisha was some kind of far relative of the reiss and pass the coordinate to eren....JUST A MAD THEORY