Henry's burst of activity in 1453 had seen him try to stem the violence caused by various disputes between noble families. These disputes gradually polarised around the long-standing Percy–Neville feud. Unfortunately for Henry, Somerset (and therefore the king) became identified with the Percy cause. This drove the Nevilles into the arms of York, who now for the first time had support among a section of the nobility. The Percy–Neville feud was a series of skirmishes, raids, and vandalism between two prominent northern English families, the House of Percy and the House of Neville, and their followers, that helped provoke the Wars of the Roses. The original reason for the long dispute is unknown, and the first outbreaks of violence were in the 1450s, prior to the Wars of the Roses.