in 1807 małachowski was placed at the head of the executive committee appointed at warsaw after its evacuation by the prussians, and when the grand duchy of warsaw was created małachowski became president of the senate under king frederick augustus i of saxony. in the negotiations with the austrian government concerning the galician salt-mines, małachowski came to the assistance of the depleted treasury by hypothesising all his estates as an additional guarantee. his death was regarded as a public calamity. in all the other towns of the grand duchy funeral services were held simultaneously as a tribute of the respect and gratitude of the polish nation.