921 (CMXXI) ebile ngwaga wa go thoma ka Laboraro, ngwaga wa bobedi ngwagengsome wa 920s, ngwaga wa bomasomepedi tee ngwagengkgolo wa Ngwagakgolo 10, le ngwaga wa bomakgolo senyane masomepedi tee ngwagengkete wa Ngwagakete 1.