Rebellious nobles were members of the aristocracy who opposed the authority of the ruling monarch or government. They often sought to challenge the established order, driven by personal ambition, political disagreements, or social injustices. Their actions could lead to conflicts, such as civil wars or uprisings, which significantly impacted the political landscape of their time. These nobles typically had significant resources and influence, allowing them to rally support from other discontented factions. Their rebellions could stem from issues like heavy taxation, loss of privileges, or the desire for greater autonomy. Historical examples include the Barons' War in England and the Fronde in France.