Historically, the term Maluku referred to the four royal centers in North Maluku, namely Ternate, Tidore, Bacan and Jailolo. A type of confederation consisting of the four kingdoms, which most likely emerged in the 14th century, was called Moloku Kie Raha or "Four Mountains of Maluku". Although the four kingdoms subsequently expanded and covered the entire North Maluku region (as now defined) and parts of Sulawesi and New Guinea, the area of expansion was originally not included in the term Maluku. This only referred to the four main clove-producing islands to the west of Halmahera: Ternate, Tidore. Moti and Makian. Bacan further to the south, and Jailolo on Halmahera, were also commonly included in Maluku Proper, the four kingdoms forming a ritual quadripartition with connotations to local cosmology.