Dietrich IX, Count of Mark
Encyclopedia
Dietrich IX, Count of Mark (1374 – 1398) was the Count of Mark from 1393 until 1398.

Dietrich was the second son of Count Adolf III of the Marck
Adolf III of the Marck
Adolph III of the Marck was the Bishop of Münster from 1357 until 1363, the Archbishop of Cologne in 1363, the Count of Cleves from 1368 until 1394, and the Count of Mark from 1391 until 1393.Adolph was the second son of Count Adolph II of the Marck...

 and Margaret of Julich.

His father had acquired the County of Cleves in 1368 and reserved this title for his eldest son Adolf
Adolph I, Duke of Cleves
Adolph I of Cleves was 2nd. Count of Cleves and 4th. Count of Mark.- Life :He was the son of Adolph III, Count of Mark, and Margaret of Julich ....

 to succeed him after his death.

Dietrich already received the title of Count of Mark in 1393, when his father was still alive.

When Dietrich fell in battle in 1398, he was succeeded by his elder brother Adolf, who had become Count of Cleves in 1394.

Thus the County of Mark and the County of Cleves were reunited again.
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