In the early centuries AD, political and administrative subdivisions began to emerge in Estonia. Two larger subdivisions appeared: the parish (Estonian: ''kihelkond'') and the county (Estonian: ''maakond''), which consisted of multiple parishes. A parish was led by elders and centered on a hill fort; in some rare cases a parish had multiple forts. By the 13th century, Estonia consisted of eight major counties: Harjumaa, Järvamaa, Läänemaa, Revala, Saaremaa, Sakala, Ugandi, and Virumaa; and six minor, single-parish counties: Alempois, Jogentagana, Mõhu, Nurmekund, Soopoolitse, and Vaiga. Counties were independent entities and engaged only in a loose cooperation against foreign threats.