Kopys, Zabłudów, Kėdainiai, Zolkow, Pomorzani, Belykamen, Kražiai), or estates (Nevel, Krasnoye, Sebezh, Musninkai, Sereya, Horodok, Sobolew, Slovatichi, Ruchai, Kolki, Vyazyn, Rafałówka, Zhmigrod, Beloozero, Yampol, Shumsk, Sverzhen, Drisvyaty, Naliboki). The family ties to the banking dynasties Altoviti and Strozzi played an important role to secure titles and wealth with the Roman Curia. After the extinction of the Olyka and older Kletsk lines, their fortunes were passed to those of the Nesvizh line. With the death of the heirless Dominik Hieronim in 1813, the Nesvizh line lost its right to the ordynat. Dominik Heronim's son, Aleksander Dominik, was born before his parents' marriage and was thus denied the title and inheritance of his forefathers. He and his descendants had their princely title confirmed by the Austrian Empire. Thus, the ordynat of Nesvizh and Olyka fell into the hands of the younger Kletsk line. This, however, cost the new owner, Antoni Radziwiłł, some diplomatic effort at the Congress of Vienna, as his cousin Dominik had fought in the Polish Legion on Napoleons' side, and Alexander I of Russia had therefore confiscated his whole property. Only because of Prussia's intervention (since Antoni was married to a Prussian princess) he was able to keep the family trust properties, mainly Nesvizh Castle and Olyka Castle with vast lands, while Mir Castle and 18,000 km² of land passed to Dominik's only legitimate child, Stephania, who had to marry a Russian subject, according to the Czar's order, whom she found in Ludwig zu Sayn-Wittgenstein-Berleburg. In this way, all three Radziwiłł ordynats ended up in the possession of one line, represented by the sons of Michal Hieronim, Ludwik Mikolaj of Kletsk and Antoni Henryk of Nesvizh and Olyka. The descendants of Antoni Henryk formed the beginning of the so-called Ordynant branch, out of the younger Kletsk line, in whose possession, other than the three older ordynats of Nesvizh, Kletsk, and Olyka, they also received the two additional titles of Przygodzice and Davyd-Haradok. The Radziwiłł family owned 23 castles and palaces. The most fortified of them were in Nesvizh, Olyka, Biržai, Biała, Slutsk, Zolkow, Pomorzany and Zolochiv. The Radziwiłłs possessed palaces in most important cities of the Rzeczpospolita, including those where the Sejm, had its sessions (Warsaw, Hrodna), or the Tribunal held its meetings (Vilnius, Lublin, Navahrudak), in province centres where the Radziwiłłs had their estates (Minsk and Lviv), and in the cities where the Radziwiłłs were economically active (Gdańsk,