The "Annals of the Four Masters" is a chronicle of medieval Irish history, compiled in the early 17th century by four scholars from Donegal. It covers events from ancient times up to the year 1616, providing a detailed account of Ireland's history, culture, and notable figures. The work is considered one of the most important sources for understanding early Irish history. The annals were written in Irish and are notable for their meticulous recording of events, including battles, kings, and significant societal changes. They serve as a vital resource for historians and researchers studying Ireland's past and its rich heritage.