According to St Nikodimos, St Isaiah the Solitary lived around the year 370 and was a contemporary Makarios the Great of Egypt. Most historians today consider him to be later in date. He is now usually identified with a monk who lived initially at Sketis in Egypt, and who then moved to Palestine at some date subsequent to 431, eventually dying in great old age as a recluse near Gaza on 11 August 491 (according to others, 489).It is evident that the author reflects the authentic spirituality of the Desert Fathers of Egypt and Palestine during the fourth and fifth centuries.