Rudolf III is considered the most important of the Margraves of Hachberg-Sausenberg.

[1] Rudolf III initiated a number of construction projects.

Two gatehouses, one large building and a tower were added to his residence Rötteln Castle in 1360.

Her dowry would be 12000florins, in the form of the city and district of Sennheim valued at 7500 florins, Istein Castle, valued at 3000 florins, 1500 florins in cash, on the condition that he would use it to create manors in the area between Hauenstein, the forest and the mountains on both sides of the river, within one year after the wedding.

As such, he was involved in the burning at the stake of the Czech reformer Jan Hus.