Background
In 1573, John VII inherited the County of Oldenburg from his father.
In 1573, John VII inherited the County of Oldenburg from his father.
In 1575, he inherited the Lordship of Jever from Maria of Jever, despite objections by Count Edzard II of East Frisia. In 1597, the Aulic Council ordered that the County of Delmenhorst be split off from Oldenburg. This separation would last until 1647.
In 1596, John VII attempted to dam the Schwarze Brack, in order to create a land link from Oldenburg to Jever.
He had to cancel this project under pressure of Edzard World War II John VII nevertheless earned the nickname "dike builder" with his costly land reclamation projects in Butjadingen and the Jade Bight. His superintendent Hamelmann unified the Lutheran confession.