7-9th century: Early formation of the land The western Balkans had been reconquered from "
barbarians" by Roman Emperor
Justinian (r. 527–565).
Sclaveni (Slavs) raided the western Balkans, including Bosnia, in the 6th century. The first mention of a Bosnian entity comes from the
De Administrando Imperio (
DAI in further text), which mention Bosnia (/Bosona) as a "small/little land" or a "small country" (/horion Bosona,) within
Serbian Principality, positioned in the upper course of the Bosna river. Historical and archaeological information on early medieval Bosnia remains inadequate. According to
DAI, Bosnia included two inhabited towns, Katera and Desnik. Katera has been thought to be identified as
Kotorac near
Sarajevo, however, according to , archaeology refutes this. Katera may have been situated in the vicinity of modern-day
Kotor Varoš, the potential site could be Bobac or Bobos, however, site only includes late medieval findings to date. Desnik remains wholly unidentified, but was thought to be near
Dešanj. Hadžijahić wholly rejected the information about location of the two towns in Bosnia, arguing that the Greek preposition in the sentence is often erroneously translated (as "in" instead of "toward"), referring to two Serbian towns toward land of Bosnia.
Relja Novaković also questioned why there was an additional mention of a land with own cities if they should be part of Serbia, concluding that Bosnia almost always was a separate country.
Francis Dvornik stated to be, "most probable-and this is accepted by most historians of the period", initially formed as part of
Croatia and later in mid-10th century was ruled by
Serbia. Danijel Dzino considered that the "political and chronological context of this short passage could be connected with the rule of Časlav".
Ecclesiastical organization If
DAI's
kastra oikoumena does not designate inhabited towns, but ecclesiastical centers instead (in 6th century is mentioned Bestoen bishopric with several episcopal centers that belonged to
Salonitan Archdiocese), as theorized by late
Tibor Živković, the two towns in question might be Bistua (
Zenica or
Vitez) and Martar (probably
Konjic). The existence of such centers is argued by Živković as evidence it was an independent state before 822. By the late 9th and early 10th century, Bosnia was mostly Christianized by
Latin priests from the
Dalmatian coastal towns, though remote pockets remained unreached. After the
East–West Schism (1054) the newly formed
Roman Catholic Diocese of Bosnia was under jurisdiction of the
Archbishop of Split, but until the end of the 12th century changed jurisdiction between Split (1060, 1182),
Bar (1089-1100, 1199) and
Dubrovnik (1102, 1124, 1153). According to
Provinciale vetus (late 12th century), its
civitas was Bosna (considered as
Visoko), and in the mid-11th century was one of 19 bishopric
civitas of the
Kingdom of Croatia and Dalmatia. In the 11-12th centuries the "Latin rite Christianity was prevalent in the west, the north and in central Bosnia", while the "Orthodox faith was predominant in the eastern districts near Serbia and the River Drina". Svetolik-Stjepan fled to Hungary because Bosnia was conquered by Croatian king Crescimirus (
Krešimir I or
Michael Krešimir II), and that Crescimirus's son Stjepan (
Stephen Držislav) and his descendants ruled over "
White Croatia" and Bosnia.
Samuel of Bulgaria (997–1014) during his conquest of Croatia moved freely through Bosnia and Serbia (which probably captured as well), but is without further evidence. Later, according to the same CPD,
Ljutovid of Zahumlje, an unnamed Ban of Bosnia, and unnamed župan of Raška (i.e. Serbia) accepted Byzantine's gifts in silver and gold to assist
Michael Anastasii against
Stefan Vojislav at the
Battle of Bar (1042).
Constantine Bodin reportedly conquered Bosnia and appointed first cousin
Stephen ( 1084–1095) as the duke of Bosnia,), the death of childless
Stiepan in 871 was followed by 17 years war which was ended by Croatian ruler
Bereslav's conquest of Bosnia, while in 972 Bosnian ruler was killed and land conquered by certain ''Sigr. Ducha d'Albania
, but another ruler of the lineage of Moravia de Harvati
(and related to previous Bosnian ruler) expelled Sigr. Ducha'' and united Bosnia.
12th century: Official semi-independent polity First reliable information about Bosnia dates from the early 12th century.
Béla II of Hungary in 1135 adopted the title of
King of Rama (possibly referring to Bosnia), and appointed his second son
Ladislaus II of Hungary as
Duke of Bosnia (
Boznensem ducatum). With presumed Hungarian conquest and political influence, in the mid-12th century emerged
Banate of Bosnia under its first ruler
Ban Borić ( 1154–1163). After the
Battle of Sirmium (1165–1167), the Byzantine–Hungarian treaty regards Bosnia "as part of Hungarian dominion taken by the Byzantines", and Byzantine emperor
Manuel I Komnenos used in honorific title of the "dalmatikos, ougrikos, bosthnikos, krobatikos", and panegyric of Michael Anchialos mentioned to "let the Croat and the Bosnian be enrolled in the tables of the Romans". After 13 years of Byzantine rule and the return of the Hungarian rule over their South Slavic possessions, during the time of
Ban Kulin (1180–1204) by practical means was an independent state, but that was constantly challenged by Hungarian kings who tried to reestablish their pre-Byzantine period authority or acted as "political seniors". ==Ethnopolitical identity==