In Amsterdam, where Jews were especially prominent in the 17th century on account of their number, wealth, education, and influence, they established poetical academies after Spanish models; two of these were the "Academia de Los Sitibundos" and the "Academia de Los Floridos". In the same city they also organized the first Jewish educational institution, with graduate classes in which, in addition to Talmudic studies, the instruction was given in the Hebrew language. The most important synagogue, or Esnoga, as it is usually called amongst Spanish and Portuguese Jews, is the Amsterdam Esnoga—usually considered the "mother synagogue", and the historical center of the Amsterdam minhag.