Angels are not part of Buddhism as it supports no supernatural pantheon of gods. However the story of Mara the Lord of Death is part of the Buddhist mythology, possibly from popular (but now forgotten) folklore . Mara is present in is part of Vedic Brahmanic traditions and other traditions such as the Jains. Mara represents the forces and temptation. Mara may have had more than one precedent in pre-Buddhist mythology. For example, it's possible he was based in part on some now-forgotten character from popular folklore such a drought demon of Vedic mythology named Namuci.