873 (DCCCLXXIII) ebile ngwaga wa go thoma ka Sontaga, ngwaga wa bone ngwagengsome wa 870s, ngwaga wa bomasomešupa tharo ngwagengkgolo wa Ngwagakgolo 9, le ngwaga wa bomakgolo seswai masomešupa tharo ngwagengkete wa Ngwagakete 1.