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.
In accordance with scholar James B. Rives, the second hypothesis seems more plausible: the amber trade route likely traversed what is now Silesia, and ancient merchants are known to have documented their journeys in detail. Moreover, the interpretatio romana of the Alcis as equivalent to Castor and Polux was probably carried out by someone from the Graeco-Roman world.