John Climacus (Greek: Ἰωάννης τῆς Κλίμακος; Latin: Ioannes Climacus; Arabic: يوحنا السلمي, romanized: Yuḥana al-Sêlmi), also known as John of the Ladder, John Scholasticus and John Sinaites, was a 6th–7th-century Christian monk at the monastery on Mount Sinai. He is revered as a saint by the Eastern Orthodox Church and Roman Catholic Church. Source: Wikipedia (en)