To celebrate the annexation of Fiji, Hercules Robinson, who was Governor of New South Wales at the time, took Cakobau and his two sons to Sydney. There was a measles outbreak in that city and the three Fijians all came down with the disease. On returning to Fiji, the colonial administrators decided not to quarantine the ship on which the convalescents travelled. This was despite the British having a very extensive knowledge of the devastating effect of infectious disease on an unexposed population. In 1875–76 the resulting epidemic of measles killed over 40,000 Fijians, about one-third of the Fijian population. Some Fijians allege that this failure of quarantine was a deliberate action to introduce the disease into the country. Historians have found no such evidence; the disease spread before the new British governor and colonial medical officers had arrived, and no quarantine rules existed under the outgoing regime.