The purpose of this essay is to investigate syncretism in burial mounds that were active burial places during the Iron Age and the change of religion from pre-christianity to christianity in Mälardalen. The study consists of a comparative analysis of two burial mounds that was recycled and has two different burials pracites on its primary and secondary graves. The essay is a literature study and based on fieldwork reports from excavations of the two burial mounds and the burial fields Spånga RAÄ 193 and Valsta RAÄ 59. Tombs can have been a visible power symbol in the landscape during the Iron Age. A physical link between the dead and the living, between people and the ownership of the earth and the odal concept. The grave ship during the Iron Age had a great variety. Concepts like syncretism can be difficult interpreted because it was used as a concept in religious history from the beginning. It deals with the process of diffrents religions meet and the consequences of that meeting.