As early as the period of royal "paternalism," during the reign of Sigismund I., the king endeavored to extend his fatherly protection to the Jewish system of communal self-government. The appointment of Michael Yosefovich as the "senior" of the Lithuanian Jews, with a rabbi as expert adviser[65], was designed to safeguard the interests of the exchequer by concentrating the power in the hands of a federation of Kahals in Lithuania. On more than one occasion Sigismund I. confirmed the "spiritual judges," or rabbis (_judices spirituales_, _doctores legis_), elected by the Jews in different parts of Poland, in their office. In 1518 he ratified, at the request of the Jews of Posen, their election of two leading rabbis, Moses and Mendel, to the posts of provincial judges for all the communities of Great Poland, bestowing upon the newly-elected officials the right of instructing and judging their coreligionists in accordance with the Jewish law. In Cracow, where the Jews were divided into two separate communities--one of native Polish Jews and another of immigrants from Bohemia,--the King empowered each of them to elect its own rabbi. The choice fell upon Rabbi Asher for the former, and upon Rabbi Peretz for the latter, community, and when a dispute arose between the two communities as to the ownership of the old synagogue, the King again intervened, and decided the case in favor of the native community (1519). In 1531 Mendel Frank, the rabbi of Brest, complained to the King that the Jews did not always respect his decisions, and brought their cases before the royal starostas. Accordingly Sigismund I. thought it necessary to warn the Jews to submit to the jurisdiction of their own "doctors," or rabbis, who dispensed justice according to the "Jewish law," and were given the right of imposing the "oath" (_herem_, excommunication) and all kinds of other penalties upon insubordinates. In the following year the King appointed as "senior," or chief rabbi, of Cracow the well-known scholar Moses Fishel--who, it may be added parenthetically, had taken the degree of Doctor of Medicine in Padua--to succeed Rabbi Asher, referred to previously. Pursuing the same policy of centralization, the King, a few years later, in 1541, confirmed in their office as chief rabbis (_seniores_) of the whole province of Little Poland two men "learned in the Jewish law," the same Rabbi Moses Fishel of Cracow, and the famous progenitor of Polish Talmudism, Rabbi Shalom Shakhna of Lublin. In the same measure, however, in which the communal organization of the Jews gained in strength, and the functions of the rabbis and Kahal elders became more clearly defined, the Government gradually receded from its attitude of paternal interference. The _magna charta_ of Jewish autonomy may be said to be represented by the charter of Sigismund Augustus, issued on August 13, 1551, which embodies the fundamental principles of self-government for the Jewish communities of Great Poland.