TRELLEBORGS, were viking ring fortresses, in Denmark, and Sweden. (Gatehouse) http://en.wikipedia.org/wiki/Viking_ring_castle | Викинги, Архитектура, Здания
Trelleborg (Slagelse) - Wikipedia
Trelleborg - Viking Ring Fortresses - (Viking Castles)
Trelleborg | Military Wiki | Fandom
Trelleborg - Wikipedia
Trelleborg Parish, Malmöhus, Sweden Genealogy • FamilySearch
FC Trelleborg - Wikipedia
File:Biblioteca de Trelleborg.jpg - Wikimedia Commons