Valjala’s second circular wall offers even more surprises. At the moment, there seems to be a remnant of another possible rampart beneath the 3 m wide rampart, in any case a decent cultural...
Kaljusaar, Kristjan. (2015). Hostages in the Baltic Crusades, Wars of Conquest and Cultural Exchange during the 12th and 13th Centuries. (EST: Pantvangid ning Läänemere ristiretked, vallutussõjad...