For most of the 17th century, Sigismund III was occupied with internal problems of his own, like the Nobles' Rebellion in the Commonwealth and the wars with Sweden and in Moldavia. However, the impostor False Dmitry I appeared in Poland in 1603 and soon found enough support among powerful magnates such as Michał Wiśniowiecki, Lew, and Jan Piotr Sapieha, who provided him with funds for a campaign against Godunov. Commonwealth magnates looked forward to material gains from the campaign and control over Russia through False Dmitriy. In addition, both Polish magnates and Russian boyars advanced plans for a union between the Commonwealth and Russia, similar to the one Lew Sapieha had discussed in 1600 (when the idea had been dismissed by Godunov). Finally, the proponents of Catholicism saw in Dmitry a tool to spread the influence of their Church eastwards, and after promises of a united Catholic dominated Russo-Polish entity waging a war on the Ottoman Empire, Jesuits also provided him with funds and education. Although Sigismund declined to support Dmitry officially with the full might of the Commonwealth, the Polish king was always happy to support pro-Catholic initiatives and provided him with the sum of 4,000 zlotys–enough for a few hundred soldiers. Nonetheless, some of Dmitriy's supporters, especially among those involved in the rebellion, actively worked to have Dmitry replace Sigismund. In exchange, in June 1604 Dmitry promised the Commonwealth "half of Smolensk territory". Many were skeptical about the future of this endeavor. Jan Zamoyski, opposed to most of Sigismund's policies, later referred to the entire False Dmitry I affair as a "comedy worthy of Plautus or Terentius".