Saint Patrick's World: The Christian Culture of Ireland's Apostolic Age

If you want to know about the ireland context in the Saint Patrick's age you can buy this book. It is very good.

This is a collection of translations of the writings of St. Patrick, his contemporaries, and heirs, with expert commentary by De Paor. He begins with an introduction to European Christianity at the time of St. Patrick. Included in the documents are the accounts of various councils and synods connected to the evangelization of Ireland, the writings of St. Patrick himself, and the annals, letters, and lives written by and of St. Patrick's followers. This is a treasure trove of materials for research into the life of St. Patrick.