Irish nobility refers to the hereditary aristocracy in Ireland, which played a significant role in the country's history. This class included various titles such as dukes, earls, and barons, often linked to specific regions or territories. Many noble families were granted lands and privileges by the English crown during the Norman invasion in the 12th century, leading to a complex social hierarchy. Over time, the influence of Irish nobility diminished, especially after the Williamite War in the late 17th century, which resulted in the loss of power for many Irish lords. Despite this decline, some noble families still exist today, preserving their heritage and traditions.