I thought it was the 475 fire of the Palace of Lausus that destroyed Olympian Zeus?t seems to have been a matter of hit and miss as to what sculpture that Constantine had taken off from Greece to Constantinople survived until the sack of the city by the Crusaders in 1204 - and the same with all the books in the libraries that were in situ in the C4th. One lot seems to have gone up in smoke in a major fire in 466 around the statue-decorated Forum of Constantine (see my 'Chronology of the Byzantine Empire 330 - 1461', TM Venning, pub Macmillan / Palgrave 2006). Though the city was intact from outside attacks from 330 right through to 1204 (something of a record?) the physical appearance of it seems to have changed with a mixture of changing needs by the state and the public, eg fewer people using the public baths in a more family- and religion-centred public culture) and some crumbling buildings not renovated. So did the sculptures and other artwork get destroyed, broken up for reuse or sold off to private buyers when the buildings fell into disrepair or were remodelled?