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After the outbreak of the Great War he remained in Warsaw and in 1917 Kakowski was appointed to be a member of the Regency Council, a semi-independent and temporary highest authority of the Kingdom of Poland, recreated by the Central Powers as part of their Mitteleuropa plan.
In the chaotic period at the end of the First World War on the Eastern Front, the Polish I Corps fought against the Bolshevik Red Army, cooperated with the German Ober Ost forces in taking Minsk, and after acknowledging the Regency Council in May 1918, it surrendered to the German forces in Babruysk.
Two rival factions, the Armagnacs and the Burgundians, vied for power within the regency council headed by the queen Isabeau of Bavaria.
On November 5, 1918, a temporary Regency Council (Regentschaftsrat) for the United Baltic Duchy, led by Baron Adolf Pilar von Pilchau, was formed on a joint basis from the two local Land Councils.
After the early death of his father in 1507, a regency council was formed, consisting of the Count of Spiegelberg, the Lord of Diepholz and his mother.