why were mummies laid in coffins
Many sacred charms and amulets were placed in and around the mummy and the wrappings. This was meant to protect the mummy from harm and to give good luck to the Ka of the mummy. Once preserved, the mummies were laid to rest in a sarcophagus inside a tomb, where it was believed that the mummy would rest eternally. In some cases the mummy's mouth would later be opened in a ritual designed to symbolize breathing, giving rise to legends about revivified mummies.