into conflict over the area, resulting in Tsarina Elizabeth issuing a decree in 1746 marking the Kalmius River as the divide between the two Cossack hosts. Sometime after 1738, the treaties of Belgrade and Niš in 1739, in addition to the Russian-Turkish convention of 1741, as well as the following likely concurrent land survey of 1743–1746 (resulting in the demarcation decree of 1746), the Zaporzhian Cossacks established a military outpost on "the high promontory on the right bank of the Kalmius river." Though the details of its construction and history are obscure, excavations have revealed Cossack artifacts, including others, within the enclosure being approximately 120 square meters in the shape of a square. The outpost was likely a modest structure in that it lay within the territory of the Ottoman Empire, and the erection of fortifications on the Sea of Azov was prohibited by the Treaty of Niš. The last Tatar raid, launched in 1769, covered a vast area, overrunning the New Russian Province with a huge army in severe wintertime weather. The raid destroyed the Kalmius fortifications and burned all the Cossack winter lodgings. In 1770, the Russian government, during the war with Turkey, moved its border with the Crimean Khanate southwest by more than two hundred kilometres. This action initiated the Dnieper fortified line (running from today's Zaporizhzhia to Novopetrovka), thereby laying claim to the region, including the site of future Mariupol, from the Ottoman Empire. Following the victory of the Russian forces, the Treaty of Küçük Kaynarca eliminated the endemic threat from Crimea. In 1775, Zaporizhzhia was incorporated into the New Russian Governorate, and part of the land claimed behind the Dnieper fortified line including modern Mariupol was incorporated in the newly re-established Azov Governorate. Russian Empire After the Russo-Turkish War from 1768 to 1774, the governor of the Azov Governorate, Vasily A. Chertkov, reported to Grigory Potemkin on 23 February 1776 that ruins of ancient domakhas (homes) had been found in the area, and in 1778 he planned the new town of Pavlovsk. However, on 29 September 1779, the city of Marianοpol () in Kalmius County was founded on the site. For the Russian authorities the city was named after the Russian Empress Maria Feodorovna; its de facto title was named after the Greek settlement of Mariampol, a suburb of Bakhchisarai in Crimea. The name was derived from the Hodegetria icon of the Holy Theotokos and