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Zeta (Cyrillic: Зета) as a crown land was a medieval region and province of the Serbian state (Principality, Kingdom, and Empire) of the Nemanjić dynasty, from the end of the 12th century, up to the middle of the 14th century. During that period, regional administration in Zeta was often bestowed to various members of the ruling dynasty, who administered the region as a crown land.
"Zeta", at the time of Mihailo I, was a župa within Duklja (known as Luška župa). From the end of the 11th century the name was also used to refer to all of Duklja, first used in Kekaumenos' military manual written in the 1080s. The term Zeta gradually replaced Duklja over the decades to denote the region.
Serbian Prince Desa Urošević conquered Duklja and Travunia in 1148, combining the title as "Prince of Primorje" (the Maritime) and co-ruled Serbia with his brother Uroš II Prvoslav from 1149 to 1153, and alone until 1162.
In 1190, Grand Župan of Rascia and Stefan Nemanja's son, Vukan II, asserted his right over Zeta. In 1219, Đorđe Nemanjić succeeded Vukan. He was succeeded by his second oldest son, Uroš I, who built the 'Uspenje Bogorodice' monastery in Morača.
Between 1276 and 1309, Zeta was ruled by Queen Jelena, widow of Serbia's King Uroš I. She restored around 50 monasteries in the region, most notably Saint Srđ and Vakh on the Bojana River. From 1309 to 1321, Zeta was co-ruled by the oldest son of King Milutin, Young King Stefan Uroš III Dečanski. Similarly, from 1321 to 1331, Stefan's young son Stefan Dušan Uroš IV Nemanjić, the future Serbian King and Emperor, co-ruled Zeta with his father.
Dušan the Mighty was crowned Emperor in 1331, and ruled until his death in 1355.
Žarko held the Lower Zeta region: he is mentioned in records from 1356, when he raided some traders from Dubrovnik, not far from Sveti Srđ at Lake Skadar. Zeta itself was held by the widow of Dušan, Jelena, who at the time was in Serres where she had her court. The next year, in June, Žarko becomes a citizen of the Republic of Venice, where he was known as "baron lord of the Serbian King, with holdings in the Zeta region and Bojana of the maritime".
Đuraš Ilijić was "Head" (Kefalija, from Greek Kephale) of Upper Zeta until his murder in 1362. Đuraš had been killed by the sons of a Balša, a nobleman that held one village during the reign of Dušan.
After Dušan, his son, Uroš the Weak ruled Serbia during the fall of the Serbian Empire; a gradual disintegration of the Empire was a result of decentralization in which provincial lords gained semi-autonomy and eventually independence. The Vlach family of Balšići wrestled the region in 1360-1362, when they defeated the two lords of Upper and Lower Zeta. Over the decades, they became an important player in the politics of the Balkans.