I don't read Spanish and I've found a potentially interesting article in Spanish (few pages long - about 7 pages): http://dialnet.unirioja.es/servlet/articulo?codigo=2039484 Click "Texto completo" to download full text. Author of the article claims that Roman poet from times of Augustus - Sextus Propertius (50 BC - 15 BC) - described Slavic people. But I don't understand much. Could someone who reads Spanish read it and describe briefly what are its author's findings ??? If true then this would be perhaps the first known certain description of Slavic people.