There was no significant wave of emigration of "conversos" from Spain, the majority of Sephardic communities, such as that of Salonika having been formed as a result of the Alhambra Decree in 1492. However, there was a steady trickle of crypto-Jewish marranos who wished to practice their faith freely to more liberal environments. One of their leaders who helped them get there was the Lisbon-born international banker, Gracia Mendes Nasi. They also migrated to Flanders, where they were attracted by its flourishing cities, such as Antwerp and Brussels. "Conversos" from Flanders, and others direct from the Iberian Peninsula, went under the guise of Catholics to Hamburg and Altona about 1580, where they established a community and held commercial relations with their former homes. Some migrated as far as Scotland. Christian IV of Denmark invited some New Christian families to settle at Glückstadt about 1626, granting certain privileges to them and to "conversos" who came to Emden about 1649.