Thuringia [SEP] named after
"Thüringen" derives from the Germanic tribe Thuringii, who emerged during the Migration Period. Their origin is largely unknown. An older theory claims that they were successors of the Hermunduri, but later research rejected the idea. Other historians argue that the Thuringians were allies of the Huns, came to central Europe together with them, and lived before in what is Galicia today. Publius Flavius Vegetius Renatus first mentioned the Thuringii around 400; during that period, the Thuringii were famous for their excellent horses.
The Thuringian Realm existed
Poppo, Duke of Thuringia
Poppo II or Boppo II (died after 906) was the Duke of Thuringia from 880 until his deposition in 892.
Poppo, a Babenberg, was the younger brother of Henry of Franconia. They also had a younger brother named Egino. All three may have been the sons or grandsons of Poppo (I) of Grapfeld. 
Poppo replaced Radulf II in the Sorbian March no later than 880. In that year, the Daleminzi, Bohemians, and Sorbs threatened to invade Thuringia and