After the death of Emperor Manoel on 24 September 1180, the Hungarian king Bela III considered that he had no more obligations to Byzantium. The following 1181, he
launched an offensive against Byzantium and conquered
Srem (Sirmium) the northeastern part of the Adriatic coast (Including
Zara) and
Zemun. Byzantium was then occupied by internal conflicts, so that there was no military response to the Hungarian conquests. In 1182, Bela III ordered an attack on Byzantine Belgrade and
Braničevo. The attack itself was quite clumsily carried out, and both fortresses were defended by experienced military leaders from the time of Emperor Manoel,
Alexius Branas and
Andronikos Lapardas. Following the death of Manuel I in 1180, his widow, the Latin princess
Maria of Antioch, acted as regent to her infant son
Alexios II Komnenos. Her regency was notorious for the favoritism shown to Latin merchants and was overthrown in April 1182 by
Andronikos I Komnenos, who entered the city in a wave of popular support. Almost immediately, the celebrations spilled over into
massacre of Latins. The usurpation of Andronikos I freed Nemanja from subordination to the Byzantine emperor. Stefan Nemanja, in alliance with the Hungarian king Bela III, launched a great offensive on Byzantium in 1183. Also, the commander of the Byzantine army, Andronicus Lampardis in Niš and Braničevo, renounced obedience to the new central authorities. At the same time, the Hungarian king Bela III conquered Byzantine
Belgrade,
Niš and
Serdica (Sofia). According to the Byzantine historian
Niketas Choniates, the Serbs, led by Nemanja, joined this campaign. The following year, Nemanja launched an offensive on the southeastern Adriatic coast and conquered Byzantine
Skadar and besieged
Dubrovnik (Ragusa). In 1185, Andronicus I was killed in Constantinople and the new Byzantine emperor
Isaac II Angelos began peace negotiations with the Hungarian king. The peace treaty provided for Emperor Isaac II to marry Bela's daughter
Margaret. The Hungarian army withdrew from the Byzantine central part of the
Balkans, leaving Nemanja without support. Fortunately for Nemanja, at the same time, the
Normans and the
Bulgarians joined the anti-Byzantine alliance. Nemanja forced
Dubrovnik (Ragusa) to replace Byzantium with Norman rule. The Normans of king
William II of Sicily, also in 1185, conquered
Dyrrachium and
Thessalonica, and embarked on an expedition to Constantinople, but they lost discipline due to large-scale looting, so the Byzantines easily defeated them in the
battle of Demetritzes near
Lower Struma. In October 1185, in the
Lower Danube, in northern Bulgaria, an uprising began, led by the brothers
Peter and
Ivan I Asen, one of the reasons for which was an extraordinary tribute that Emperor Isaac II ordered to be collected for his wedding. Nemanja then coordinated actions with the Asen brothers against Byzantium. In September 1186, Nemanja and his brothers "made peace with the city of Dubrovnik", ruled by William II.
Between two emperors '' (19th century) by
Kosta Mandrović Meanwhile,
Ayyubid sultan
Ṣalāḥ al-Dīn captured
Jerusalem in 1187. Due to the
fall of Jerusalem in the Latin West, there was a great commotion that started the
Third Crusade. A large crusader army led by Holy Roman Emperor
Frederick Barbarossa marched in 1189 from
Buda through
Belgrade and
Niš to
Adrianople and
Constantinople. is part of Byzantine provincial church architecture dating from 11th and 12th centuries. It was built after the reign
Basil II (976 - 1025) and Restoration of Byzantium, most likely in the second half of the 11th century. The Church is modest one-nave building in the shape of an elongated inscribed cross with a dome. It is a central-type building whose model should be recognized in the
Hagia Sophia, Thessaloniki. In Niš, in the new capital of Stefan Nemanja, the German emperor and the grand zoupan met at the end of July 1189. At the meeting, Nemanja asked Barbarossa for the Crusaders to promise him lands the Serbians recently conquered in exchange of aiding the Crusaders in war against Byzantium. However, Barbarossa rejected this proposal in a diplomatic manner, wanting to ensure only a safe passage for his army through Byzantium. His main goal, however, remained the liberation of Jerusalem. A month later, negotiations began between the Crusaders and the Byzantines over the passage with great tension. At that time, according to Christian doctrine, there could be only one emperor in the Christian world. Hence the great rivalry and tension between the Eastern Roman Empire (historiographically known as Byzantium) and the Holy Roman Empire. The Crusaders captured
Philippopolis and
Adrianople and prepared for an attack on
Constantinople. Nemanja takes advantage of this situation and launches an offensive towards Byzantine
Skopje. Meanwhile, in February 1190, an agreement was reached between the two emperors at
Adrianople to allow the Crusader army to cross the
Dardanelles. During the uncertain negotiations, Emperor Isaac II replied that the new friendship between the Crusaders and the Serbs was very difficult for him. In June 1190, Frederick Barbarossa drowned in the river
Saleph. At the same time, Byzantine Emperor
Isaac II Angelos launched a punitive expedition against the Serbs, and Nemanja was defeated in the battle at South Morava (1191). In fact, Constantinople did not want to subdue the Serbs, but to regain
Niš and the main road to
Belgrade, as well as to make allies of the rebellious Serbs. The peace treaty in 1193 provided for
Stefan Nemanjić, the middle son of the Grand Župan Stefan Nemanja, to marry a Byzantine princess
Eudokia Angelina, i.e. niece of the Byzantine emperor. ==Return to Byzantium==