Sulfuric acid the Hellenistic alchemical works of Zosimos of Panopolis, in the treatise "Phisica et Mystica", and the Leyden papyrus X. Medieval Islamic era alchemists, Jābir ibn Hayyān (c. 721 – c. 815 AD, also known as Geber), Razi (865 – 925 AD), and Jamal Din al-Watwat (d. 1318, wrote the book "Mabāhij al-fikar wa-manāhij al-'ibar"), included vitriol in their mineral classification lists. Ibn Sina focused on its medical uses and different varieties of vitriol. Sulfuric acid was called "oil of vitriol" by medieval European alchemists because it was prepared by roasting "green vitriol" (iron(II) sulfate) in an iron retort. There are
Oil wrestling it harder for the wrestler grip one's opponent. This form continued to what is today known as Yağlı Güreş or Turkish oil wrestling. In the Ottoman Empire, wrestlers learned the art in special schools called tekke (), which were not merely athletic centres, but also spiritual centres. Wrestlers oil one another prior to matches as a demonstration of balance and mutual respect. If a man defeats an older opponent, he kisses the latter's hand (a sign of respect for elders in Turkey). Matches are held all over Turkey throughout the year, but in early summer, around 1000 competitors gather in