- 1019: First mentioned.
- 1809: French soldiers occupy the village, with other villages of the area it became part of the "Mairie Witten".
- 1885: Incorporation with the "Landkreis Hoerde"
- 1929: Incorporation with Witten.
- 1991–1993: The campus of the Witten/Herdecke University was built in Wullen.
- uni-wh.de, official website of the university (German)