also included Dutch, British and other western or northern European settlers whom the Russians came to indiscriminately refer to as "Germans"). They were only gradually allowed in other cities, so as to prevent the spread of alien ideas to the general population. In his youth, Peter the Great spent much time in the 'German' quarter. When he became Tsar, he brought more German experts (and other foreigners) into Russia, and particularly into government service, in his attempts to westernise the empire. He also brought in German engineers to supervise the construction of the new city of Saint Petersburg. Catherine the Great, herself ethnically German, invited Germanic farmers to immigrate and settle in Russian lands along the Volga River. She guaranteed them the right to retain their language, religion and culture. Ethnic Germans were also sent by her in organised colonisation attempts aiming at Germanisation of conquered Polish areas. Also in other areas with an ethnic German minority people of other than German descent assimilated with the ethnic German culture and formed then a part of the minority. Examples are people of Baltic and Scandinavian descent, who assimilated into the minority of the Baltic Germans. Jews of Posen province, Galicia, Bukovina and Bohemia, with their Yiddish culture derived in part from their German heritage, often mingled into the ethnic German culture, thus forming part of the various ethnic German minorities. But anti-Semitic Nazis later rejected Jewish ethnic Germans and all Jewish German citizens as 'racially' German. Frederick the Great (reigned 1740–1786) settled around 300,000 colonists in the eastern provinces of Prussia, acquired in the First Partition of Poland of 1772, with the intention of replacing the Polish nobility. He treated the Poles with contempt and likened the "slovenly Polish trash" in newly occupied West Prussia to Iroquois, the historic Native American confederacy based in what is now the state of New York. Prussia encouraged a second round of colonisation with the goal of Germanisation after 1832. Prussia passed laws to encourage Germanisation of the Prussian Partition including the provinces of Posen and West Prussia in the late 19th century. The Prussian Settlement Commission relocated 154,000 colonists, including locals. Treaty of Versailles The reconstitution of Poland following the Treaty of Versailles (1919) made ethnic German minorities of some Prussian provinces of the German Empire citizens of the Polish nation state. Ethnic German inhabitants of provinces of the dissolved Austro-Hungarian Empire, such as