He left two minor sons, Daniel and Vasylko, who were unable to take power because of age, resulting in a succession crisis.

The Igorovichs, supported by the Hungarians, initially gained the upper hand, but their brutal rule, including the massacre of boyars, provoked resistance and weakened their position.

This period was characterised by dynamic changes in alliances, short-lived victories and growing rivalry between the Romanovichs and the Hungarians, who sought full control of Halich.

In 1214, Leszek the White made an agreement with King Andrew II of Hungary in an attempt to divide spheres of influence in the Principality of Halych.

This agreement led to a short-lived strengthening of Hungarian influence, but resistance from Daniel and his allies made it impossible to maintain permanent control over the region.

The situation was further complicated by Mongol incursions, which weakened both the Ruthenians and their neighbours, forcing the Romanovichs to temporarily withdraw to Polish lands.

The war culminated in the Battle of Yaroslavl in 1245, in which Daniel, supported by the Polovtsians, defeated the forces of Rostislav, Béla IV and Boleslav the Chaste.

Over the course of the 11th and 12th centuries, Poland had numerous conflicts with Kievan Rus' over the Cherven Cities, strategically located on the borders of both states.

[12][13] After the death of Roman the Great, his sons, Daniel of Galicia and Vasylko Romanovich, inherited a state in political chaos.

In response, Roman's wife, Anna Euphrosyne, asked for help from King Andrew II of Hungary, who agreed to provide assistance.

[16] Despite the defeat of the Hungarian army at Mikulin, they managed to defend Halych against the allied forces of Rurik and Olgovichi, temporarily repelling their claims.

[19] The Hungarians and Poles attempted to stabilise their territories through intervention,[20] which led to the division of the Principality of Galicia-Volhynia into spheres of influence.

[24] Eventually, however, Polish-Hungarian forces crushed the Igorevich army at the Battle of Zvenigorod, temporarily restoring stability in the duchy.

[27] In 1213, Daniel lost power due to the actions of the boyars, who invited the Peresopnician prince, Mstislav the Nemesis, to the throne.

[28] The situation prompted the King of Hungary to launch another armed expedition, after which he installed Vladislav Kormilchyc as governor on the throne of Halych.

[36] Leszek, perceiving the threat, tried to extricate himself from the situation by making a deal with Hungary, this led to the outbreak of the Polish-Hungarian-Ruthenian War.

[43] The negotiations that began ended favourably for Andrew II, For Leszek it was a complete defeat, giving rise to the failure of his Rus' policy.

[46] Mstislav, trying to take the initiative, suffered a series of defeats, starting with a battle in an unknown location[47] and ending with an unsuccessful expedition to Volhynia.

After the death of Mstislav Mstislavovich, power in the principality of Galicia fell to the Hungarian king Andrew, which was a failure of Daniel's policy, who, although he was on good terms with the Novgorod prince, did not receive the succession, a major setback.

[55] In 1230, Daniel took advantage of the absence of the pro-Hungarian boyar Sudyslav and attacked the Principality of Halych, taking the town without a fight.

[73] Konrad of Mazovia, wishing to resolve the Drohiczyn problem (Daniel had staked his claim to the region in 1237), decided to use the Order of Dobrzyń in a manner analogous to his actions of 1226 in the matter of the Prussians.

[80] Forced to flee from the Mongol onslaught, Daniel and his brother Vasylko first took refuge in Hungary[81] and then in Mazovia, where they were given shelter by Bolesław I of Masovia.

[82] After Daniel Romanovych had recaptured Halych, Rostislav Mikhailovich, seeking support, turned to King Béla IV of Hungary for help, becoming engaged to his daughter Anna.

Daniel and his brother Vasylko, knowing of the impending threat, tried to secure support from Mindaugas, a Lithuanian prince, and Konrad of Mazovia, but according to the Galician–Volhynian Chronicle, neither side took part in the battle.

The attack was initiated by the army of Rostislav, which was supported by the Polish commander Florian Wojciechowicz and the Hungarian general File.

[88][89] The defeat of the Rotislav's coalition was a watershed event, ending the 40-year struggle for succession in Halych and sealing the victory of the Romanovichi.