sentences:  In 1263 following the Treaty of Montgomery his father was restored to some of his lands in return for agreeing to pay homage to Llywelyn as Prince of Wales.However, good relations between Powys Wenwynwyn and Gwynedd were short-lived as Owen and his father were soon implicated in an assassination attempt on the Prince of Wales in 1274.This led to Owen and his father fleeing to Shrewsbury where they both led border raids against the Principality of Wales on behalf of the English crown.