What came before. The toponym is ancient to the region.
Convo:
 --What is Magnesia Prefecture?
 --Magnesia Prefecture Magnesia Prefecture () was one of the prefectures of Greece.
 --What was the capital?
 --Its capital was Volos.
 --When was it established?
 --It was established in 1899 from the Larissa Prefecture.
 --When was it disbanded?
 --The prefecture was disbanded on 1 January 2011 by the Kallikratis programme, and split into the regional units of Magnesia and the Sporades.
 --What is the toponym?
 --