"Count John VII of Oldenburg and Delmenhorst (nicknamed "the Dike Builder"; 9 September 1540 in Oldenburg – 12 November 1603 in Oldenburg) was a member of the House of Oldenburg and was the ruling Count of County of Oldenburg from 1573 until his death. His parents were Count Anthony I of Oldenburg and Sophie of Saxe-Lauenburg." - (en.wikipedia.org 30.01.2020)