The prince (sometimes called king) of Zetta, Yovan Vladimir, tried to stop the triumphal march of the Bulgarian Tsar Samuel through the Serb provinces, but in 989 was defeated, made prisoner and sent to Samuel's capital, Prespa.
The historical fact that Vladimir married Kossara, the daughter of Samuel, and was sent back to Zetta as reigning prince under the Bulgarian suzerainty, forms the subject of the first Serb novel, Vladimir and Kossara, as early as the 13th century.
But after the death of Samuel the Bulgarian power rapidly lost the Serb provinces, which, to get rid of the Bulgarians, again acknowledged the Greek overlordship. About 1042, however, Prince Voislav of Travuniya (Trebinje), cousin of the assassinated Vladimir of Zetta, started a successful insurrection against the Greeks, and united under his own rule Travuniya, Zahumlye and Zetta.
Prizren-Timok, KossovoRessava, Shumadiya-Srem (Syrmia), Zetta-Bosnia, Adriatic coast.
Of all the Servian dialects the most correct, richest and softest is the Herzegovinian or Zetta-Bosnian dialect.