Although the Sicilians generally translated directly from the Greek, when Greek texts were not available, they would translate from Arabic. Admiral Eugene of Sicily translated Ptolemy's "Optics" into Latin, drawing on his knowledge of all three languages in the task. Accursius of Pistoja's translations included the works of Galen and Hunayn ibn Ishaq. Gerard de Sabloneta translated Avicenna's "The Canon of Medicine" and al-Razi's "Almansor". Fibonacci presented the first complete European account of the Hindu-Arabic numeral system from Arabic sources in his "Liber Abaci" (1202). The "Aphorismi" by Masawaiyh (Mesue) was translated by an anonymous translator in late 11th or early 12th century Italy. James of Venice, who probably spent some years in Constantinople, translated Aristotle's "Posterior Analytics" from Greek into Latin in the mid-12th century, thus making the complete Aristotelian logical corpus, the "Organon", available in Latin for the first time. In 13th century Padua, Bonacosa translated Averroes' medical work "Kitab al-Kulliyyat" as "Colliget", and John of Capua translated the "Kitab al-Taysir" by Ibn Zuhr (Avenzoar) as "Theisir". In 13th century Sicily, Faraj ben Salem translated Rhazes' "al-Hawi" as "Continens" as well as Ibn Butlan's "Tacuinum sanitatis". Also in 13th century Italy, Simon of Genoa and Abraham Tortuensis translated Abulcasis' "Al-Tasrif" as "Liber servitoris", Alcoati's "Congregatio sive liber de oculis", and the "Liber de simplicibus medicinis" by a pseudo-Serapion  As early as the end of the 10th century, European scholars travelled to Spain to study. Most notable among these was Gerbert of Aurillac (later Pope Sylvester II) who studied mathematics in the region of the Spanish March around Barcelona. Translations, however, did not begin in Spain until after 1085 when Toledo was reconquered by Christians. The early translators in Spain focused heavily on scientific works, especially mathematics and astronomy, with a second area of interest including the Qur'an and other Islamic texts.