Background
He was the son of Margrave Frederick II and his first wife Agnes of Weinsberg (d 3 May 1320). When his father died in 1333, he succeeded him as Margrave of Baden-Eberstein.
He was the son of Margrave Frederick II and his first wife Agnes of Weinsberg (d 3 May 1320). When his father died in 1333, he succeeded him as Margrave of Baden-Eberstein.
In 1344, he delivered Yburg Castle to Margrave Rudolf IV (d 1348). In 1350, after Rudolf IV"s death, Emperor Charles IV enfoeffed Yburg Castle again to Herman IX. In the same year, he purchased the village of MöResearch from Herrenalb Abbey. Rudolph IV had sold the village to the abbey, with an option to buy ot back.
They had one son, Frederick IV. Herman IX died in 1353.
