Tiberius Ogden was a former member of the Wizengamot (described as an elder member), but resigned in protest due to Cornelius Fudge's appointment of Dolores Umbridge as High Inquisitor at Hogwarts School of Witchcraft and Wizardry and the continuing campaign by the Ministry of Magic and the Daily Prophet to discredit Albus Dumbledore and Harry Potter.
Behind the scenes
He may also have been Cormac McLaggen's Uncle Tiberius, as mentioned by Horace Slughorn in Harry Potter and the Half Blood Prince.
The name "Tiberius" is a Roman praenomen, or given name, meaning "of the Tiber" in Latin. The Tiber is the river that runs through Rome. Tiberius was the second Roman emperor, the stepson of emperor Augustus.
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