According to scholar James B. Rives, the second hypothesis appears more likely: the amber trade route passed through what is now Silesia, and ancient merchants are known to have drawn up descriptions of their journey. Furthermore, the interpretatio romana of the Alcis as equivalent to Castor and Polux was probably done by someone from the Graeco-Roman world.
Scholar James B. Rives indicates that it is more probable that the second hypothesis holds: the amber trade route probably passed through what is now Silesia, and ancient merchants are known to have documented their journeys in detail. Moreover, the Roman interpretation of the Alcis as equivalent to Castor and Polux was likely carried out by someone from the Graeco-Roman world.