Gildas' 'On the Ruin of Britain' is a seminal work of early British literature that offers a scathing critique of the moral decay and political turmoil plaguing post-Roman Britain. Written in the form of a jeremiad, the text presents a stark depiction of a society in decline, rife with corruption and injustice. Gildas' literary style is characterized by its uncompromising tone and vivid imagery, drawing on biblical and classical sources to underscore the gravity of the situation. This work is considered one of the primary sources for understanding the period following the Roman withdrawal from Britain. Gildas' poignant commentary serves as a cautionary tale for future generations, highlighting the consequences of societal breakdown. The author's background as a monk and historian likely informed his perspective, lending credibility to his observations and convictions. 'On the Ruin of Britain' is a must-read for anyone interested in the intersection of history, literature, and ethics, offering valuable insights into a pivotal moment in British history.