www.castle.lv

Anchor text: Medieval Castles of Latvia

Wikipedia: History of Latvia

Anchor text: Генрих Латвийский Хроника Ливонии (Russian)

Wikipedia: Principality of Koknese

Anchor text: Генрих Латвийский Хроника Ливонии (Russian)

Wikipedia: Metsepole

Anchor text: Full-text of the chronicle in Russian

Wikipedia: Hermann von Wartberge

Anchor text: ''Neck Ditch''

Wikipedia: Neck ditch

Anchor text: here

Wikipedia: Daugavgrīva castle