Short answers, pulled from the story.
Philostratus the Younger was a Greek sophist of the Roman imperial period who lived during the third century AD. He is also known as Philostratus of Lemnos, though this name appears less frequently in historical records.
The only surviving work attributed to Philostratus the Younger is the second series of Imagines which survives only partially. This text functions both as an extension and as a commentary on the first series written by his maternal grandfather.
Scholars place the creation of the second Imagines between 250 AD and 300 AD though no exact year can be confirmed for Philostratus the Younger. The fifty-year window reflects uncertainty about when the author actually composed his work.
A compelling theory suggests that Philostratus the Younger might be identical to the man who served as archon of Athens in 255 AD. No direct evidence links the two figures beyond circumstantial alignment of dates and names so historians remain divided over whether they represent the same person.
One notable edition appeared in 1870 under editor C. L. Kayser published in Leipzig by B. G. Teubneri. Another significant version emerged in 1902 edited by C. Shenkl and A. Reisch also from Leipzig.