 It remaining a separately ruled territory in Holstein until its line was extinct in 1640, when Holstein-Pinneberg was merged into the then Duchy of Holstein.Furthermore, the here mentioned rulers of course only reigned Holstein and Schleswig in their respective territorial composition of the time, thus without states and territories only merged later in what became today's State of Schleswig-Holstein, such as Ditmarsh, conquered and annexed in 1559, Saxe-Lauenburg merged in 1876, Heligoland (British rule 1807–1891), Free and Hanseatic City of Lübeck, Region of Lübeck, together with some Hamburgian exclaves in 1937.In turn much of the current westerly, northerly and easterly suburbs within Greater Hamburg were ceded from Holstein on 1 April 1937 (Cf.