In 1105, however, Robert's continual stirring of discord with his brother in England as well as civil disorder in Normandy itself prompted Henry to invade Normandy. Orderic reports on an incident at Easter 1105 when Robert was supposed to hear a sermon by the venerable Serlo, Bishop of Sées. Robert spent the night before sporting with harlots and jesters and while he lay in bed sleeping off his drunkenness his unworthy friends stole his clothes. He awoke to find himself naked and had to remain in bed and missed the sermon.