Nikolaus, Hereditary Grand Duke of Oldenburg

Nikolaus, Hereditary Grand Duke of Oldenburg was the eldest son of Frederick Augustus II, Grand Duke of Oldenburg, who was the last ruling Grand Duke of Oldenburg.

Nikolaus was born at Oldenburg, Grand Duchy of Oldenburg, the third child and first son of Frederick Augustus II, Grand Duke of Oldenburg , and his wife, Duchess Elisabeth Alexandrine of MecklenburgSchwerin , .

Source: Wikipedia