Yığma Tepe Tumulus is thougt to be a burial of an Attalid king.The first excavations in the tumulus were initiated in 1878 by austrian archaeologist Alexander Conze.
See:
- http://arkeofili.com/pergamondaki-en-buyuk-tumulusun-yapim-yontemleri-arastirildi/
- Olivier Henry, Ute Kelp, Tumulus as Sema: Space, Politics, Culture and Religion in the First Millennium BC, Walter de Gruyter 2016, pp. 1993, 2007
