During this time they were administrated from Tranquebar (in continental Danish India) administrated under the name of Frederiksøerne; missionaries from the Moravian Church Brethren's settlement in Tranquebar attempted a settlement on Nancowry and died in great numbers from disease; the islands were repeatedly abandoned due to outbreaks of malaria: 1784–1807/09, 1830–1834 and finally from 1848 gradually for good.