Wolfram says that King Nebuchadnezzar of Babylon was the maternal uncle of King Pompeius of Babylon – one of two brothers who fought with the Baruc of Baghdad and who Perceval’s father Gahmuret died fighting against.
If Wolfram intends to indicate the legendary King Nebuchadnezzar who ruled 605-562 BC – and it seems he does – Pompeius must have been a truly ancient man.
Source
Parzival | Wolfram von Eschenbach, 1200–1210
Historical Nebuchadnezzar
Nebuchadnezzar was a king of the ancient Babylonian Empire who ruled from 605 to 562 BC. He is known for his military conquests, architectural achievements, and cultural advancements during his reign. Nebuchadnezzar is perhaps most famous for his role in the siege of Jerusalem in 587 BC, during which he destroyed the city and its temple, and deported many of its inhabitants to Babylon.
In addition to his military campaigns, Nebuchadnezzar was a great builder, and he commissioned many impressive construction projects, including the famous Hanging Gardens of Babylon, which were considered one of the Seven Wonders of the Ancient World. He also made significant contributions to the fields of astronomy and mathematics, and his empire was known for its rich culture and literature.
Nebuchadnezzar is also a prominent figure in the Bible, where he is mentioned in several books, including the books of Jeremiah, Daniel, and Ezekiel. In the book of Daniel, Nebuchadnezzar has a dream that is interpreted by the prophet Daniel, and he is later driven insane and forced to live like a wild animal for a period of time as a punishment from God.