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cydnabu'r gwas sifil o'r bedwaredd ganrif ar bymtheg , edwin chadwick , bwysigrwydd cyflwyno mesurau iechyd y cyhoedd i atal clefydau rhag lledaenu ac o ganlyniad i gyfraddau marwolaeth a oedd yn codi'n gyflym
the nineteenth century civil servant , edwin chadwick , recognised the importance of introducing public health measures to prevent the spread of disease and as a result of rapidly rising mortality rates