Marcian (Latin: Flavius Marcianus Augustus; 392 – 27 January 457) was Byzantine Emperor from 450 to 457. Marcian's rule marked a recovery of the Eastern Empire, which the Emperor protected from external menaces and reformed economically and financially. On the other side, the isolationistic policies of Marcian left the Western Roman Empire without help against barbarian attacks, which materialized in the Italian campaigns of Attila and in the Vandal sack of Rome (455).