Text: The oldest most striking of the Byzantine monuments, in the northern corner of the city center, is the fifth-century Mausoleum of Galla Placidia.
Entailment: The Mausoleum of Galla Placidia from the fifth-century is the most ancient of the Byzantine monuments.
Contradiction: The most recent of the Byzantine monuments was built in the fifteenth century and is called the Mausoleum of Galla Placidia.