Isaac the Syrian lived the solitary life in the 7th century.
In ch.5, h.
Isaac returns frequently in this work to the theme of joy as it relates to repentance and also to inebriation - even as it were, as a participation in divine Nature.
These discourses are primarily for solitaries to consolidate them in the love and mercy of God.
After life as a monk, then briefly as a bishop, he withdrew to live the solitary life.
He was born in Qatar and subsequently lived in present day Iraq and Iran.
Isaac the Syrian lived the solitary life in the 7th century