John Climacus (Ancient Greek: Ἰωάννης τῆς Κλίμακος; Latin: Ioannes Climacus; Arabic: يوحنا السلمي, romanized: Yuḥana al-Sêlmi; c. 579 – 649), 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 Catholic Church.
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