Although not themselves sources of law, Anglo-Saxon charters are a most valuable historical source for tracing the actual legal practices of the various Anglo-Saxon communities. A charter was a written document from a king or other authority confirming a grant either of land or some other valuable right. Their prevalence in the Anglo-Saxon state is a sign of sophistication. They were frequently appealed to and relied upon in litigation. Making grants and confirming those made by others was a major way in which Anglo-Saxon kings demonstrated their authority.