Kruto
Kruto made his capital out of a large palisaded fortress at Buku , an island in the confluence of the Trave and Wakenitz rivers and site of the later Lübeck . 
<triplet> Trave <subj> Wakenitz <obj> tributary <triplet> Wakenitz <subj> Trave <obj> mouth of the watercourse <triplet> Lübeck <subj> Trave <obj> located in or next to body of water <subj> Wakenitz <obj> located in or next to body of water