This octagonal building was created as a mausoleum for Diocletian, the infamous persecutor of Christians, back in the year 311; by the seventh century, it was converted into a cathedral.

Diocletian was notorious for persecuting Christians. But a thousand years ago, his mausoleum was converted into the Cathedral of St. Dominus. And so, ironically, what Diocletian built to glorify ...

Some 1,700 years on, the Emperor Diocletian would still recognise his palace – or the shell of it, at least. This vast, rectangular complex fell into disuse in the sixth century, 300 years after ...