Russian President Vladimir Putin was visiting Karyes, the administrative center of the Orthodox enclave of Mount Athos. The above photo, of Putin standing at an ancient throne alongside Greek officials and Orthodox dignitaries (as is the local custom for greeting visiting Orthodox heads of state on Mount Athos), was described by various Russian news outlets, both within the country and abroad, as Putin standing at a place which had until now been reserved only for Byzantine emperors.
The source of the headlines in Russian media is a tweet from the Komsomolskaya Pravda reporter in the pool. For a Russian media always looking to glorify the achievements of their leader, it was a fact perhaps too good to check.
[The post has been edited and updated to focus more on the genesis of the misreporting.]