Hartmann von Aue tells us that a tournament was held between the cities of Prurin and Tarebron (Tenebroc), in which Erec excelled.
Wolfram says that Erec defeated his brother-in-law, Duke Orguelleus, at the tourney.
Sources
Erec | Hartmann von Aue, late 12th century
Parzival | Wolfram von Eschenbach, 1200–1210