1638 (MDCXXXVIII) ebile ngwaga wa go thoma ka Labohlano, ngwaga wa bosenyane ngwagengsome wa 1630s, ngwaga wa bomasometharo seswai ngwagengkgolo wa Ngwagakgolo 17, le ngwaga wa bomakgolo tshela masometharo seswai ngwagengkete wa Ngwagakete 2.