Text: A second, deeply eroded stone obelisk is known as the Column of Constantine Porphyrogenitus, as an inscription on its base records that the emperor of that name (a.d.913 959) had it restored and sheathed in gilded bronze plates.
Entailment: A worn obelisk made of stone is called the Column of Constantine Porphyrogenitus.
Contradiction: The inscription on the obelisk says that Constantine Porphyrogenitus wanted to have it torn down, but never got around to it.