1811 is the year when the first Ashkenazi Jews settled in Baku, but their mass immigration to what is now Azerbaijan did not start until the 1870s. Their immigration was relatively steady leading them to outnumber the local Mountain Jewish community by 1910. They settled mostly in the booming oil-rich city of Baku. The Caspian-Black Sea Company, one of the leading oil companies in the Russian Empire, was established in Baku by the wealthy Rothschild family of German Jewish origin. Ashkenazi Jews continued immigrating to Azerbaijan until the late 1940s, with a number of them being World War II evacuees from Russia, Ukraine and Belarus who chose to stay in their country of refuge.