After the
Polish–Austrian War,
West Galicia was incorporated into the
Duchy of Warsaw, and the estate was once again divided. In 1812, its capital was moved from Zamość to Zwierzyniec, as the
Zamość Fortress was being transferred to the Polish government (the transfer itself was not completed until 1821, when the fortress together with the town of Zamość officially became property of the government of
Congress Poland). In exchange, the Zamoyski family was given estates in
Mazovia and
Podlasie. In 1811,
Stanislaw Kostka Zamoyski, the 11th ordynat, opened in Warsaw a public Library of the Zamoyski Fee Tail, which was based on the Zamojski Academy, closed down in 1784. The 13th ordynat,
Konstanty Zamoyski, introduced several changes to the estate. In 1833, he created the Central Office of Goods and Businesses of the Zamoyski Family, as well as General Administration Office in
Zwierzyniec. Zamoyski divided the office into four departments (legal, administrative, political and economic), each with its own manager. At the same time,
serfdom was gradually withdrawn and replaced by money wages (15
grosz per one day of work). Furthermore, to increase profits several
folwarks were rented to private owners, and the management of the forests took on a planned shape. In the mid-19th century, the estate had an area of 373,723 hectares, and its population was 107,764, with nine towns, 291 villages, 116 folwarks, 41 mills, eight breweries, seven distilleries and several other enterprises. Altogether, the profits of the fee tail were estimated at 1.4 million zlotys annually. Following the
Emancipation reform of 1861, which in 1864 was introduced in the Russian-controlled
Congress Poland, the area of the estate was reduced, as well as its income, since peasants ceased to pay their feudal obligations. Nevertheless, due to skillful management, the fee tail was profitable, allowing the 14th ordynat
Tomasz Franciszek Zamoyski to expand the palace at
Klemensow, together with the neglected library. Among most important items kept in the library was the
Codex Suprasliensis. At the outbreak of
World War I the estate was a well-functioning enterprise, with 156 folwarks divided into three keys. The fee tail had several factories, and its own narrow gauge rail line. The war devastated the estate, and further destruction was brought on by the
Polish-Soviet War, when soldiers of
Semyon Budyonny captured Klemensow. Altogether, the losses of the estate were estimated at 8.5 million roubles.
Maurycy Klemens Zamoyski, the 15th ordynat, actively supported Poland's fight for independence, and in the 1922 presidential elections he was a candidate of the conservative parties, running against
Gabriel Narutowicz. During the Polish-Soviet War, he handed his estate as a
lien to the French government, to pay for the military
materiel which had been provided to the
Polish Army. == Second Polish Republic and World War II ==