The colony began when Carl Peters, an adventurer who founded the Society for German Colonization, signed treaties with several native chieftains on the mainland opposite Zanzibar. On 3 March 1885, the German government announced that it had granted an imperial charter, which was signed by Chancellor Otto von Bismarck on 27 February 1885. The charter was granted to Peters' company and was intended to establish a protectorate in the African Great Lakes region. Peters then recruited specialists who began exploring south to the Rufiji River and north to Witu, near Lamu on the coast.