831 (DCCCXXXI) ebile ngwaga wa go thoma ka Laboraro, ngwaga wa bobedi ngwagengsome wa 830s, ngwaga wa bomasometharo tee ngwagengkgolo wa Ngwagakgolo 9, le ngwaga wa bomakgolo seswai masometharo tee ngwagengkete wa Ngwagakete 1.