At the start of the Viking age, the Vikings believed in the Norse religion. They believed in a of gods and goddesses, as well as "Valhalla", a heaven for warriors. The lower class of society would go to a place called "hel", similar to life on earth. According to Viking beliefs, Viking chieftains would please their war-gods by their bravery, and would become "worth-ship"; that is, the chieftain would earn a "burial at sea". They also performed land burials which often still included a ship, treasure, weapons, tools, clothing and even slaves and women buried alive with the dead chieftain, for his journey to Valhalla and adventure in the after-life. Poets composed sagas about the exploits of these chieftains, keeping their memories alive.