. . "In the 13th century C\u00F6lln was the sister town of Old Berlin (Altberlin), located on the southern Spree Island in the Margraviate of Brandenburg. Today the island is located in the historic core of the central Mitte locality of modern Berlin. Its northern peak is known as Museum Island, while the part south of Gertraudenstra\u00DFe is called Fischerinsel (Fisher Island)."@en .