1421 (MCDXXI) ebile ngwaga wa go thoma ka Mošupologo, ngwaga wa bobedi ngwagengsome wa 1420s, ngwaga wa bomasomepedi tee ngwagengkgolo wa Ngwagakgolo 15, le ngwaga wa bomakgolo nne masomepedi tee ngwagengkete wa Ngwagakete 2.