Henry II became King of England in 1154 and established control over parts of Wales, Scotland, and western France, making him the first true King of England from the House of Plantagenet. He appointed his friend Thomas Becket as Chancellor, though Becket later became Archbishop of Canterbury and the two had a falling out over whether the church or crown held more power. In a moment of frustration with Becket, Henry uttered words questioning why no one had rid him of the troublesome priest, which some knights took as an order to kill Becket. On December 29th, those knights murdered Becket in Canterbury Cathedral, making him a martyr and the cathedral a site of pilgrimage.