John Climacus

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.

Notable works: The Ladder of Divine Ascent

Source: Wikipedia — https://en.wikipedia.org/wiki/John_Climacus