House of Oldenburg

The Northern German House of Oldenburg has ruled the kingdoms of Denmark and Norway since the mid-15th century. Since their inception they have established several precedents that have forged a collective Scandinavian identity. Though the house was particularly prominent in Denmark, the Schleswig-Holstein-Gottorp cadet branch made several powerful inroads throughout Scandinavia and its peripheries. Through its linkage to the Russian House of Romanov, its power stretched deep into Siberia. The Oldenburgs adopted several reforms that established the framework of Northern European commerce. Tolls from the Oresund Customs House provided over half of Denmark’s total income, allowing it to establish a firm hand in administrative affairs throughout the Baltic region. In 1783, facing the disruption of transatlantic trade by the belligerent Royal Navy of Britain, the House of Oldenburg established the League of Armed Neutrality, which aimed to protect neutral shipping during wartime.

From the game's History encyclopedia, AoE3: DE 100.19.18309.