found:Reglement wegen Abkürzung und Verbesserung des gerichtlichen Verfahrens bey Ober- und Untergerichten im Herzogthum Oldenburg, [1802]:caption title (Herzogthum Oldenburg)
found:History.state.gov, September 3, 2021(Oldenburg attained its independence from Denmark in 1773 and in 1777 was elevated to the status of duchy. Thus, when the United States announced its independence from Great Britain in 1776, Oldenburg was a sovereign, independent state. Annexed by France in 1810, the Duchy of Oldenburg was restored and elevated to the status of Grand Duchy following the 1815 Congress of Vienna.)