What is "landdag"

A Landdag (plural: Landdagen) was a political ceremony staged regularly by Dutch East India Company (VOC) authorities during the period of Dutch rule of Taiwan, known then as Formosa. This mass gathering of Dutch colonists and their aboriginal Formosan subjects was conceived as a device through which the Dutch, by means of a calculated display of power, prestige and paternal largesse, sought to cement their authority and the legitimacy of their rule over the native population. The Dutch word Landdag (literally “country day” or "country assembly"), sometimes also called rijksdag on Dutch Formosa, is roughly equivalent to the English word Diet.