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Boryslav (Борислав; Borysław) is a city located on the Tysmenytsia (a tributary of the Dniester), in Drohobych Raion, Lviv Oblast (region) of western Ukraine. It hosts the administration of Boryslav urban hromada, one of the hromadas of Ukraine. Boryslav is a major center of the petroleum and ozokerite industries. Population: The area of the modern town of Boryslav has been inhabited at least since the Bronze Age. There are remnants of a pagan shrine from the 1st millennium BC located in the area, where approximately 270 petroglyphs are found, mostly depicting solar signs – symbols of a pre-Christian Solar deity. Between the 9th and 13th centuries, the site of the modern town housed a fortress named Tustan, which was part of a belt of similar strongholds defending the Kievan Rus' from the west and south. After the dissolution of Kievan Rus', the town became a part of the Halych-Volhynian Principality. With the collapse of the latter, in 1387 Boryslav became a part of the Crown of the Kingdom of Poland. In 1772, during the Partitions of Poland, it was annexed by Austria and became a part of the Austrian Kingdom of Galicia and Lodomeria. One of the great technological developments of the 19th century was the discovery by pharmacists Johan (Jan) Zeh (:uk:Зег Ян, :pl:Jan Zeh) (1817–1897)) and Ignacy Łukasiewicz, in nearby Lviv, of technology that led to the establishment of a new industry based on petroleum. Scientists worked out a method of distilling Boryslaw crude oil, and on 30 March 1853 made the first kerosene lamp. As early as 31 July 1853 their new lamp was used to illuminate the Public Hospital in Lviv. Their discoveries marked the beginnings of the rapid search for petroleum in the Carpathians — especially in the eastern sector of the mountain chain where rich oil deposits were discovered. In 1854 the first ozokerite mine was started in the town after the ore was discovered by Robert Doms.

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Boryslav

Drohobych

Drohobych (Дрого́бич, droˈɦɔbɪt͡ʃ; Drohobycz; דראָהאָבּיטש;) is a city of regional significance in Lviv Oblast, Ukraine. It is the administrative center of Drohobych Raion and hosts the administration of Drohobych urban hromada, one of the hromadas of Ukraine. In 1939–1941 and 1944–1959 it was the center of Drohobych Oblast. The city was founded at the end of eleventh century as an important trading post and transport node between Kyiv Rus' and the lands to the West of Rus'.

Curzon Line

The Curzon Line was a proposed demarcation line between the Second Polish Republic and the Soviet Union, two new states emerging after World War I. Based on a suggestion by Herbert James Paton, it was first proposed in 1919 by Lord Curzon, the British Foreign Secretary, to the Supreme War Council as a diplomatic basis for a future border agreement. The line became a major geopolitical factor during World War II, when the USSR invaded eastern Poland, resulting in the split of Poland's territory between the USSR and Nazi Germany along the Curzon Line.