The site of over 35 hectares was protected from the East, North and Northwest by a deep valley.
Excavations have revealed the defensive walls, a Roman civic basilica, an early Christian basilica with two crypts and a huge water reservoir.
The walls had 32 bastions of various shapes and 3 main and 2 secondary gates. The double north gate was designed to enclose and trap attackers.
Zaldapa is included in the list of fortifications renovated during the reign of Emperor Justinian I the Great (527-565). It was also mentioned as the seat of a bishop.
In 2015, a Greek stone inscription has been discovered by the archaeologists excavating the ruins of a Christian bishop's basilica in the fortress of Zaldapa.
- Archaeologists Find Huge Crypt with Early Christian Martyrs’ Bones in Roman, Byzantine City Zaldapa in Northeast Bulgaria: http://archaeologyinbulgaria.com/2017/01/19/archaeologists-find-huge-crypt-with-early-christian-martyrs-bones-in-roman-byzantine-city-zaldapa-in-northeast-bulgaria/
- Zaldapa Fortress – Abrit / Dobrin, Bulgaria: http://archaeologyinbulgaria.com/background-infonotes/fortresses-cities/zaldapa-fortress-abrit-dobrin-bulgaria/
- BULGARIAN ARCHAEOLOGISTS FIND STONE INSCRIPTION, RED MARBLE PILLAR IN BISHOP’S BASILICA IN ROMAN AND BYZANTINE FORTRESS ZALDAPA
- Olteanu, Sorin. "Zaldapa-Zeldepa". Linguae Thraco-Daco-Moesorum (in Romanian). Retrieved 22 May 2011.
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