How did England decide to become a Monarchy when the country began?

For most primitive societies, there is a need for a specific leader, one who they look up to. Most likely, the chosen leader was the one who seemed to have the capabilities not only to lead the people but also to ensure their survival. That is why leaders are perceived and ought to be strong as they have to strive to survive against other peoples that might pose a threat to the group and to the elements as well.