The source for many of these legends seems to have been the "Pseudo-Berosus" published by Annio da Viterbo in 1498, now widely considered a forgery. However, the earlier "Chronicle of San Juan de la Peña" by the historian-king Pedro IV of Aragon (c. 1370) includes the basic premises, that Tubal was the first person to settle in Iberia, that the Iberians were descended from him as Jerome and Isidore had attested, and that they had originally been called "Cetubales" and been settled along the Ebro, before changing their name to 'Iberians' after that river. An earlier scholar-king, Alfonso X of Castile (c. 1280), also included similar details in his history, but claiming Tubal had settled in the "Aspa" mountains (part of the Pyrenees), and deriving the first part of the name "Cetubales" from "cetus", which he said meant "tribe". In his version, they later changed their name to 'Celtiberians'. A still earlier version is found in the history of the Umayyad conquest of Hispania by Tariq ibn Ziyad, written around AD 750 by Abulcasim Tarif Abentarique. It holds that Japheth's son Tubal or (Sem Tofail) divided Iberia among his 3 sons — leaving his eldest Tarraho the northeast section (called "Tarrahon", later Aragon); to his second son, Sem Tofail the younger, he left the west, along the ocean (later called "Setúbal"); and to his youngest, Iber, he left the eastern part, along the Mediterranean, called "Iberia". Tubal then built for himself a city he called "Morar" (today Mérida, Spain) — where Abentarique claimed to have seen a large stone above the main city gate inscribed with these details, which he translated into Arabic. The Arabic dictionary "Taj al-Arus" by al-Zubaidi (1790) notes that although some Islamic authors make the Khazars descendants of Japheth's son Khasheh (Meshech), others hold both the Khazars and Saqaliba (Slavs) to have come rather from his brother, Tubal. The Caucasian Iberians were ancestors of modern Georgians.