657 (DCLVII) ebile ngwaga wa go thoma ka Labone, ngwaga wa boseswai ngwagengsome wa 650s, ngwaga wa bomasomehlano šupa ngwagengkgolo wa Ngwagakgolo 7, le ngwaga wa bomakgolo tshela masomehlano šupa ngwagengkete wa Ngwagakete 1.