The Rantavainionmäki cemetery is located on the eastern shore of Lake Rautavesi. The cemetery comprises 15 burial mounds and a level underground burial area. No signs of the latter can be distinguished above ground. The first finds from this cemetery are from the 1940s when a bronze ring, burnt bone, pottery fragments and coal from the Merovingian Period (500–800 AD) were discovered in Mound No. 1. One of the mounds and part of the associated underground burial site were excavated in 1981, and spearheads, fragments of jewellery and burnt bone were found. The items date from the Migration Period to the Merovingian Period (ca. 500–750 AD). The excavations revealed a total of 260 iron objects or fragments, 117 bronze objects or fragments, 31 glass beads, 69 kg of burnt bone, 2108 g of iron slag and 12 kg of unidentified fragments of iron.