In the 17th century, by pressure of Kabardian princes, Ossetians started a second wave of migration from the North Caucasus to Georgia. Ossetian peasants, who were migrating to the mountainous areas of the South Caucasus, often settled in the lands of Georgian feudal lords. The Georgian King of the Kingdom of Kartli permitted Ossetians to immigrate. According to Russian ambassador to Georgia Mikhail Tatishchev, at the beginning of the 17th century there was already a small group of Ossetians living near the headwaters of the Greater Liakhvi River. In the 1770s there were more Ossetians living in Kartli than ever before. This period has been documented in the travel diaries of Johann Anton Güldenstädt who visited Georgia in 1772. The Baltic German explorer called modern North Ossetia simply Ossetia, while he wrote that Kartli (the areas of modern-day South Ossetia) was populated by Georgians and the mountainous areas were populated by both Georgians and Ossetians. Güldenstädt also wrote that the northernmost border of Kartli is the Major Caucasus Ridge. By the end of 18th century, the ultimate sites of Ossetian settlement on the territory of modern South Ossetia were in Kudaro (Jejora river estuary), Greater Liakhvi gorge, the gorge of Little Liakhvi, Ksani River gorge, Guda (Tetri Aragvi estuary) and Truso (Terek estuary).