A characteristic feature of the Galician principality was the important role of the nobility and citizens in political life, and consideration a will which was the main condition for the princely rule.

According to Mykhailo Hrushevsky the realm of Halych was passed to Rostyslav upon the death of his father Vladimir Yaroslavich, but he was banished out of it later by his uncle to Tmutarakan.

[4][5][6] In the year 907 tribes of Croats and Dulebes were involved in the military campaign against Constantinople led by Rus' Prince Oleg of Kiev.

[12] The four sons of the Rostystlavych Brothers divided the area into four parts with centres in Przemysl (Rostislav), Zvenyhorod (Volodymyrko), Halych and Terebovlia (Ivan and Yuriy).

Yaroslav began his reign with the Battle on the river Siret in 1153 with Grand Prince Iziaslav, which resulted a heavy losses for the Galicians but led to the retreat of Izyaslav, who died shortly thereafter.

These diplomatic successes enabled Yaroslav to focus on the internal development of the Principality: the construction of new buildings in the capital and other cities, enrichment of monasteries, as well as strengthening his power over the territory in lower courses of Dniester, Prut and Danube rivers.

[16] Despite his strong position in the international arena, Yaroslav was under the control of the Galicians citizens whose will he had to consider even sometimes in matters of his personal, and family life.

In the same period, Byzantine emperor Manuel I Komnenos attempted to draw the Russian principalities into his net of diplomacy directed against Hungary.

Following the deaths of both Iziaslav and Vladimirko, the situation became reversed; when Yuri of Suzdal, Manuel's ally, took over Kiev and Yaroslav, the new ruler of Principality of Galicia, adopted a pro-Hungarian stance.

This situation, holding out the alarming prospect of Andronikos making a bid for Manuel's throne sponsored by both Galicia and Hungary, spurred the Byzantines into an unprecedented flurry of diplomacy.

A mission to Kiev, then ruled by Prince Rostislav, resulted in a favourable treaty and a pledge to supply the Empire with auxiliary troops; Yaroslav of Galicia was also persuaded to renounce his Hungarian connections and return fully into the imperial fold.

[18] The restoration of relations with Galicia had an immediate benefit for Manuel when, in 1166, he dispatched two armies to attack the eastern provinces of Hungary in a vast pincer movement.

Contrary to the will of Yaroslav Osmomysl, who left the throne to his younger son Oleg, the Galicians invited his brother Vladimir II Yaroslavich, and later, after conflict with him, Roman the Great, prince of Volodymyr.

However, the vulgar behaviour of the Hungarian garrison and their attempts to install Roman Catholic rites[21] led to another change in mood and to the throne again was returned Vladimir II, who ruled in Halych next decade up to the year 1199.

[22] Following next six years lasted a period of continued repression against the nobility and active citizens as well as a significant territorial and political expansion that transformed Halych into the main centre of all Rus'.

Further successful war with Igorevich Brother's contenders for the Galician throne enabled Roman the Great to establish his control over Kiev and place there his henchmen, one of them with the consent of Vsevolod the Big Nest.

After victorious campaigns against the Cumans, and probably Lithuanians, Roman the Great reached the height of its power and was called in the annals as "The Tzar and Autocrator of all Rus'".

After the failure of the Hungarian King's campaign, the local community had made a unique step in the history of Rus', enthroned in 1211 or 1213[28] one of the Galician nobles[29][30] Volodyslav Kormylchych.

As a result of the siege and the death of Andrew Daniel briefly seized the capital, but was forced to leave it not finding support of citizens majority.

[37] During the Mongol invasion, Halych turns in the hands of Daniel, but his power was not certain, because at this time chronicle mentions an ascension to the throne a loсal nobleman Dobroslav Suddych.

[40] In 1349, after the death of Dmytro, Polish King Casimir III the Great marched on Lviv, while coercing with the Golden Horde[41] and the Hungarian kingdom.