Duke of
Oldenburg| Germany | English | French | Year | Memo |
| Friedrich August | 1777-1785 | C.of Oldenburg | ||
| Wilhelm | 1785-1823 | |||
| Peter | 1823-1829 | |||
| Paul Friedrich August | 1829 | GD.of Oldenburg |
1777 to be from Count, 1815 get the tile of Grand Duke, but not use util 1829, 1829 to be Grand Duke.