Tumulus S-3 dates to the first half of the 6th century BC, See: Gabriel Pizzorno, Gareth Darbyshire: Mapping Gordion in: C. Brian Rose eds, The Archaeology of Phrygian Gordion, Royal City of Midas: Gordion Special Studies 7 (2013). pp. 23-38 http://www.tayproject.org/TAYages.fm$Retrieve?CagNo=9493&html=ages_detail_e.html&layout=web