Dietrich or Theoderic of Oldenburg, also known as Dietrich the Lucky, was Count of Oldenburg and Delmenhorst. He was known as "Fortunatus" for securing Delmenhorst for his branch of the House of Oldenburg.
- Occupation
- aristocrat
- Citizenship
- Holy Roman Empire
- Born
- 1390, January 1, 1390
- Died
- February 14, 1440