Kingdom of Galicia–Volhynia
Reign of Daniel (1245–1264)

Daniel strengthened his relations with Batu Khan by traveling to his capital Sarai and acknowledging, at least nominally, the supremacy of the Mongol Golden Horde. After meeting with Batu Khan in 1246, Daniel reorganized his army along Mongol lines and equipped it with Mongolian weapons, although Daniel himself maintained the traditional attire of a Rus' prince. According to Vernadsky (1970), Daniel's alliance with the Mongols was merely tactical; he pursued a long-term strategy of resistance to the Mongols. On the other hand, Magocsi (2010) argued that Daniel submitted to the Mongols, citing the Galician–Volhynian Chronicle, which decried Daniel 'is now on his knees and is called a slave' and called this event 'the greatest disgrace'. Magocsi stated that, 'although he never acknowledged it', Daniel was a Mongol vassal, who collected the Mongol tribute, and generally helped 'establishing Mongol administrative control over eastern Europe in cooperation with those Rus' princes who could be made to see the advantages of the new Pax Mongolica.' According to Magocsi, Daniel's submission to the Mongols ensured the strength and prosperity of Galicia–Volhynia. He did renew his alliances with Hungary, Poland and Lithuania, making plans to forge an anti-Mongol coalition with them to wage a crusade against the Khan; although these were never carried out, it would eventually lead to Daniel's royal coronation by papal legate in 1253. This brought Galicia–Volhynia into the orbit of the western European feudal order, and the Roman Catholic Church.

In 1245, Pope Innocent IV allowed Daniel to be crowned king. Daniel wanted more than recognition, commenting bitterly that he expected an army when he received the crown. Although Daniel promised to promote recognition of the Pope to his people, his realm continued to be ecclesiastically independent from Rome. Thus, Daniel was the only member of the Rurik dynasty to have been crowned king. Daniel was crowned by the papal legate Opizo de Mezzano in Dorohochyn 1253 as the first King of Ruthenia (Rex Russiae; 1253–1264). In 1256, Daniel succeeded in driving the Mongols out of Volhynia, and a year later he defeated their attempts to capture the cities of Lutsk and Volodymyr. Upon the approach of a large army under the Mongolian general Boroldai in 1260; however, Daniel was forced to accept their authority and to raze the fortifications he had built against them.

Under Daniel's reign, the Kingdom of Galicia–Volhynia was one of the most powerful states in east central Europe, and it has been described as a 'golden age' for Galicia–Volhynia. Literature flourished, producing the Galician–Volhynian Chronicle. Demographic growth was enhanced by immigration from the west and the south, including Germans and Armenians. Commerce developed due to trade routes linking the Black Sea with Poland, Germany, and the Baltic basin. Major cities, which served as important economic and cultural centers, included Lviv (where the royal seat would later be moved by Daniel's son), Volodymyr, Halych, Kholm (Daniel's capital), Peremyshl, Dorohychyn, and Terebovlya. Galicia–Volhynia was important enough that in 1252, Daniel was able to marry his son Roman to Gertrude of Babenberg, heiress of the Duchy of Austria, in the vain hope of securing the latter for his family. Another son, Shvarn, married a daughter of Mindaugas, Lithuania's first king, and briefly ruled that land from 1267 to 1269. At the peak of its expansion, the Galician–Volhynian state contained not only south-western Rus lands, including Red Ruthenia and Black Ruthenia, but also briefly controlled the Brodnici on the Black Sea.
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