Analysis of information sources in references of the Wikipedia article "Kingdom of Galicia–Volhynia" in English language version.
Danylo unified Volhynia. He failed in several attempts to gain control of the princely Halych, but finally succeeded in 1238, with the support of the burghers. The next year he took Kyiv, which had entered his sphere of influence earlier, and placed Voivode Dmytro in charge of the principality.