Nicaean Empire in the context of "Golem of Kruja"

Demetrio Progoni (Albanian: Dhimitër Progoni) was an Albanian leader who ruled as Prince of the Albanians from 1208 to 1216 the Principality of Arbanon, the first Albanian quasi state. He was the successor and brother of Gjin Progoni and their father, Progon of Kruja. Following the collapse of the Byzantine Empire in the Fourth Crusade, he managed to further secure the independence of Arbanon and extended its influence to its maximum height. Throughout much his rule he was in struggle against the Republic of Venice, Zeta of Đorđe Nemanjić and later the Despotate of Epiros and inversely, maintained good relations with their rivals, the Republic of Ragusa, and at first Stefan Nemanjić of Raška, whose daughter Komnena he married. The Gëziq inscription found in the Catholic church of Ndërfandë (modern Gëziq) shows that by the end of his life he was a Catholic. In Latin documents, of the time, he is often styled as princeps Arbanorum (prince of the Albanians) and in Byzantine documents as megas archon and later as Panhypersebastos. Under increasing pressure from the Despotate of Epiros, his death around 1216 marks the end of Arbanon as a state and the beginning of a period of autonomy until its final ruler Golem of Kruja joined the Nicaean Empire. The annexation sparked the Rebellion of Arbanon in 1257. He didn't have any sons to continue his dynasty, but his wealth and a part of his domain in Mirdita passed after Demetrio's death to his underage nephew, Progon (son of Gjin), whom he named protosevastos. The Dukagjini family which appeared in historical record 70 years later in the same region may have been relatives or direct descendants of the Progoni.

In historical record, Dhimitër Progoni is the first ruler to call himself Prince of the Albanians and the first to identify his domain as Principatum Albaniae (Principality of Albania/Arbanon). Many later feudal rulers of Albania would lay claim to the same title and present their rule as the continuation of this state. The first to do so was Charles I of Anjou who sought to legitimise the Kingdom of Albania as a descendant state of the Principality of Arbanon about 60 years later, in 1272.

The Byzantine–Ottoman wars were a series of decisive conflicts between the Byzantine Greeks and Ottoman Turks and their allies that led to the final destruction of the Byzantine Empire and the rise of the Ottoman Empire. The Byzantines, already having been in a weak state even before the partitioning of their Empire following the 4th Crusade, failed to recover fully under the rule of the Palaiologos dynasty. Thus, the Byzantines faced increasingly disastrous defeats at the hands of the Ottomans. Ultimately, they lost Constantinople in 1453, formally ending the conflicts (however, several Byzantine Holdouts lasted until 1479).

Taking advantage of the situation, the Seljuk Sultanate of Rum began seizing territory in western Anatolia, until the Nicaean Empire was able to repulse the Seljuk Turks from the remaining territories still under Byzantine rule. Eventually Constantinople was re-taken from the Latin Empire in 1261 by the Nicaean Empire. The position of the Byzantine Empire in Europe remained uncertain due to the presence of the rivals in Epirus, Serbia and Bulgaria. This, combined with the declining power of the Sultanate of Rum (Byzantium's chief rival in Asia Minor) led to the removal of troops from Anatolia to maintain Byzantium's grip on Thrace.

Alexios I Megas Komnenos (Greek: Αλέξιος Κομνηνός; Georgian: ალექსი კომნენოსი; c. 1182 – 1 February 1222) or Alexius I Megas Comnenus with his brother David, the founder of the Empire of Trebizond and its ruler from 1204 until his death in 1222. The two brothers were the only male descendants of the Byzantine Emperor Andronikos I, who had been dethroned and killed in 1185, and thus claimed to represent the legitimate government of the Empire following the conquest of Constantinople by the Fourth Crusade in 1204. Although his rivals governing the Nicaean Empire succeeded in becoming the de facto successors, and rendered his dynastic claims to the imperial throne moot, Alexios' descendants continued to emphasize both their heritage and connection to the Komnenian dynasty by later referring to themselves as Megas Komnenos ("grand Komnenos").

While his brother David conquered a number of Byzantine provinces in northwestern Anatolia, Alexios defended his capital Trebizond from an unsuccessful siege by the Seljuk Turks around the year 1205. Further details of his reign are sparse. Muslim chroniclers record how, in 1214, Alexios was captured by the Turks in the field while defending Sinope; despite sending an envoy to seek their surrender the city refused to capitulate to Sultan Kaykaus I, and Alexios was tortured in sight of the Sinopians. The city submitted to Kaykaus and Alexios was freed after becoming Kaykaus' vassal. Alexios died at the age of forty.

The Byzantine Empire was ruled by emperors of the Palaiologos dynasty in the period between 1261 and 1453, from the restoration of Byzantine rule to Constantinople by the usurper Michael VIII Palaiologos following its recapture from the Latin Empire, founded after the Fourth Crusade (1204), up to the Fall of Constantinople to the Ottoman Empire. Together with the preceding Nicaean Empire and the contemporary Frankokratia, this period is known as the late Byzantine Empire.

From the start, the regime faced numerous problems. The Turks of Asia Minor had begun conducting raids and expanding into Byzantine territory in Asia Minor by 1263, just two years after the enthronement of the first Palaiologos emperor Michael VIII. Anatolia, which had formed the very heart of the shrinking empire, was systematically lost to numerous Turkic ghazis, whose raids evolved into conquering expeditions inspired by Islamic zeal, the prospect of economic gain, and the desire to seek refuge from the Mongols after the disastrous Battle of Köse Dağ in 1243. The Palaiologoi were engaged on several fronts, often continually, while the empire's supply of food and manpower dwindled. In this period, the Byzantine Empire found itself continually at war, both civil and interstate, with most interstate conflicts being with other Christian empires. Most commonly, these comprised the Second Bulgarian Empire, the Serbian Empire, the remnants of the Latin Empire and even the Knights Hospitaller.

John IV Doukas Laskaris (or Ducas Lascaris) (Greek: Ἰωάννης Δούκας Λάσκαρις, romanized: Iōánnēs Doúkās Láskaris; December 25, 1250 – c. 1305) was the fourth emperor of the Nicaean Empire from August 16, 1258 to December 25, 1261, one of the Greek successor states formed after the Sack of Constantinople by the Roman Catholics during the Fourth Crusade. He was the last emperor from the prominent Laskarid dynasty and the last to only rule Nicaea before the Reconquest of Constantinople by his successor in 1261.