Emden (ˈɛmdn̩) is an independent city and seaport in Lower Saxony in the northwest of Germany, on the river Ems. It is the main city of the region of East Frisia and, in 2011, had a total population of 51,528. The exact founding date of Emden is unknown, but it has existed at least since the 8th century. Older names for Emden are Setutanda, Amuthon, Embda, Emda, Embden and Embderland. Town privilege and the town's coat of arms, the Engelke up de Muer (The Little Angel on the Wall) was granted by Emperor Maximilian I in 1495. In the 16th century, Emden briefly became an important centre for the Protestant Reformation under the rule of Countess Anna von Oldenburg who was determined to find a religious "third way" between Lutheranism and Catholicism. In 1542 she invited the Polish noble John Laski (or Johannes a Lasco) to become pastor of a Protestant church at Emden, and for seven years he continued to spread the new religion around the area of East Frisia. However, in 1549 following pressure from the Emperor Charles V, the Countess was forced to ask Laski to leave for England and the experiment came to an end. Nevertheless, the legacy was important for the reformation in the Netherlands. At the end of the 16th century, Emden experienced a period of great prosperity. Due to the Spanish blockade of Flemish and Brabant ports at the start of the Dutch Revolt, Emden became the most important transshipment port on the North Sea. Thousands of Protestant refugees came from Flanders and the Duchy of Brabant to the Protestant city Emden to escape persecution by the Spanish rulers of the Low Countries. During this period, the predominantly Calvinist Emden came into conflict with the Lutheran counts of East Friesland. The Emden Revolution in 1595 resulted in Emden becoming a distinct city-state. With the support of the Dutch Republic, Emden became a free government city under the protection of the Dutch Republic. The Brabantian dialect became the official language of trade and civil administration.