Abstract: This paper is studying peat and soil from the former lake Bokaren in stavby parish. The peat comes from a darkening around a skeleton that was dug out in 2015. The purpose is to investigate whether the previously measured level of arsenic found in previous analyzes can say something about the individual/skeleton found in Bokaren. Is it possible to determine whether the individual has been exposed to arsenic during his life or is naturally present on the spot. The purpose is also to include this in a discussion about poison and poisonings in a prehistoric context, as a possible cause of death for bog bodies?

The aim of this thesis is to expand the understanding of horses from ritual and everyday contexts, respectively, by investigating their diet and mobility. In this thesis, teeth of domestic horse Equus ferus caballus from the wetland Bokaren and central place Gamla Uppsala in Uppland during the late Iron Age (550-1050 A.D) are analyzed. The material consists of 44 teeth from 23 distinct horses from wetlands, wells, postholes, and settlement that were compared against each other, to discover diet and mobility similarities, differences, variations, and life history changes between different ritual and everyday contexts. It was conducted through a multi-isotope (δ13C, δ15N, δ34S and 87Sr/86Sr) analysis of equine cheek teeth in EA-IRMS and LA-MC-ICP-MS. The results indicate that the horses from ritual and everyday context were adapted to different livestock practices, according to their mobility, function, and priority. Horses used for transport were prioritized with nutritious and protein-rich feeding. In contrast to work- and multifunctional horses from Gamla Uppsala that show signs of prolonged nutritional stress caused by the fact that they did not meet their protein intake. A majority of the horses were non-local, they consumed food from the same region, and they may have come from more northern regions in Sweden and/or Finland. / Tidens Vatten