-- Who is depicted?

 The Bosporan Kingdom was a client of the Roman Empire. It outlasted all others, only briefly becoming a province under the Emperor Nero. Located in Crimea, on the shores of the Cimmerian Bosporus, its prosperous territory was originally a Greek colony. A large amount of archaeological evidence has since been uncovered there, including gold work, imported goods and textile fragments. The remains of the city of Panticapaeum, which was built on Mount Mithridat, still stand today, despite being hit by an earthquake in 70BC and sacked by the Huns in AD370. This is largely due to a revival during the Roman period that saw these great cities protected and incorporated into new fortresses.

-- Technical/Specification about the statue

 A stele  is a stone or wooden slab, generally taller than it is wide, erected in ancient Western culture as a monument, very often for funerary or commemorative purposes ("grave steles"). Stelae as slabs of stone may also be used for ancient Greek and Latin government notices or as territorial markers to mark borders or delineate land ownership. The surface of the stele may very often have text and/ or have ornamentation. This ornamentation may be inscribed, carved in relief, or painted onto the slab. Traditional Western gravestones may technically be considered the modern equivalent of ancient stelae, though the term is very rarely applied in this way. Equally, stelae-like forms in non-Western cultures may be called by other terms, and the words "stele" and "stelae" are most consistently applied in archaeological contexts to objects from Europe, the ancient Near East and Egypt, China, and sometimes Pre-Columbian America.

-- More about the artist

We don't know who is the creator of this stele, it is way too old, and there is any signature to identify who it could be.