Gojslav was a monarch who co-ruled the Kingdom of Croatia

Kingdom of Croatia (medieval)

The Kingdom of Croatia , also known as the Kingdom of the Croats , was a medieval kingdom covering most of what is today Croatia and Bosnia and Herzegovina in the Balkans.Established in 925, it ruled as a sovereign state for almost two centuries...

 with his brother Krešimir III

Krešimir III of Croatia

Krešimir III was a King of Croatia in 1000–1030 from the House of Trpimirović and founder of its cadet line House of Krešimirović. He was the middle son of former King Stjepan Držislav. Until 1020, he co-ruled with his brother Gojslav.-Reign:...

 from 1000 to his death in 1020. He was the youngest son of the former Croatian King Stjepan Držislav

Stjepan Držislav

Stephen Držislav was a King of Croatia from 969 AD until his death in 997. He was a member of the Trpimirović dynasty. He ruled from Biograd with Godemir as his Ban.-Early period:...

 and a member of royal House of Trpimirović.

Revolt and reign

After Croatia's King Stjepan Držislav died in 997, his brother Svetoslav Suronja

Svetoslav Suronja

Svetoslav Suronja was King of Croatia from 997 to 1000. He was a member of House of Trpimirović. He reigned with the help of his Ban, Varda. His name was Svetoslav, but because of his physiology and, probably, his temper, he was nicknamed Suronja which could be translated as dark man or cold man....

 has become King of Croatia. Together with brother Krešimir III

Krešimir III of Croatia

Krešimir III was a King of Croatia in 1000–1030 from the House of Trpimirović and founder of its cadet line House of Krešimirović. He was the middle son of former King Stjepan Držislav. Until 1020, he co-ruled with his brother Gojslav.-Reign:...

 he has revolted against Svetoslav Suronja

Svetoslav Suronja

Svetoslav Suronja was King of Croatia from 997 to 1000. He was a member of House of Trpimirović. He reigned with the help of his Ban, Varda. His name was Svetoslav, but because of his physiology and, probably, his temper, he was nicknamed Suronja which could be translated as dark man or cold man....

. Because Croatian king has been ally of Byzantine Empire

Byzantine Empire

The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

 during war with First Bulgarian Empire

First Bulgarian Empire

The First Bulgarian Empire was a medieval Bulgarian state founded in the north-eastern Balkans in c. 680 by the Bulgars, uniting with seven South Slavic tribes...

 revolters has asked Bulgarian help. Answer on that demand has been Bulgarian invasion of 998 during which emperor Samuil

Samuil of Bulgaria

Samuel was the Emperor of the First Bulgarian Empire from 997 to 6 October 1014. From 980 to 997, he was a general under Roman I of Bulgaria, the second surviving son of Emperor Peter I of Bulgaria, and co-ruled with him, as Roman bestowed upon him the command of the army and the effective royal...

 has taken Croatian Dalmatia and great parts of Bosnia. After end of military operations Bulgarian emperor has given this territory to Gojslav and Krešimir III

Krešimir III of Croatia

Krešimir III was a King of Croatia in 1000–1030 from the House of Trpimirović and founder of its cadet line House of Krešimirović. He was the middle son of former King Stjepan Držislav. Until 1020, he co-ruled with his brother Gojslav.-Reign:...

. During last two years (999–1000) of Croatian civil war this two revolters have with Bulgarian help defeated Svetoslav Suronja

Svetoslav Suronja

Svetoslav Suronja was King of Croatia from 997 to 1000. He was a member of House of Trpimirović. He reigned with the help of his Ban, Varda. His name was Svetoslav, but because of his physiology and, probably, his temper, he was nicknamed Suronja which could be translated as dark man or cold man....

 which has gone to Venetia exile in year 1000. Answering that political change Venetian Doge Pietro II Orseolo

Pietro II Orseolo

Pietro II Orseolo was the Doge of Venice from 991 to 1009.He began the period of eastern expansion of Venice that lasted for the better part of 500 years...

 has started military intervention in Dalmatia in which he will defeat Croatia.

Gojslav and Krešimir III

Krešimir III of Croatia

Krešimir III was a King of Croatia in 1000–1030 from the House of Trpimirović and founder of its cadet line House of Krešimirović. He was the middle son of former King Stjepan Držislav. Until 1020, he co-ruled with his brother Gojslav.-Reign:...

 have spent their reign attempting to restore rule over the Dalmatian cities that were now under Venetian control. This brought upon them a conflict with Croatia former protector, the Republic of Venice

Republic of Venice

The Republic of Venice or Venetian Republic was a state originating from the city of Venice in Northeastern Italy. It existed for over a millennium, from the late 7th century until 1797. It was formally known as the Most Serene Republic of Venice and is often referred to as La Serenissima, in...

, in 1018. Peace was concluded upon the diplomatic intervention of Byzantine Emperor Basil II

Basil II

Basil II , known in his time as Basil the Porphyrogenitus and Basil the Young to distinguish him from his ancestor Basil I the Macedonian, was a Byzantine emperor from the Macedonian dynasty who reigned from 10 January 976 to 15 December 1025.The first part of his long reign was dominated...

 which has confirmed Gojslav and Krešimir III

Krešimir III of Croatia

Krešimir III was a King of Croatia in 1000–1030 from the House of Trpimirović and founder of its cadet line House of Krešimirović. He was the middle son of former King Stjepan Držislav. Until 1020, he co-ruled with his brother Gojslav.-Reign:...

, as Byzantine vassal, kings of Croatia after defeat of First Bulgarian Empire.

He died in 1020.

Footnotes