The Normans first arrived in Ireland in 1169 AD when King Henry II of England sent Norman knights led by Richard de Clare, known as Strongbow, to help Dermot McMurrough, the king of Leinster, who was being threatened by other Irish kings. Dermot promised Strongbow his daughter's hand in marriage and that he could become the next King of Leinster if he helped him. The Normans landed first at Bannow Bay in Wexford and began conquering parts of Ireland, building motte and bailey castles made of wood and later stronger stone castles.