The title derives from the Greek καστροφύλαξ and may be translated as “guardian of a fortress.” It originally denoted the commander of a fortified place and, in the institution’s later development, the principal military deputy of the kephale. A kephale was the governor of a town or district, so the kastrophylax belonged to the local military-administrative hierarchy. The Bulgarian documents, however, do not describe his powers in detail.
The forms “КАСТРОФИЛАКЪ” and the plural “КАСТРОФИЛАЦИ” occur in two imperial charters. In the Virgin Charter, the office appears twice in lists of officials: once after the sebast, praktor, and knez, and once after the sebast and doux. In the Vitosha Charter, the kastrophylax stands immediately after the praktor among the subordinates of the kephale of Sredets. These positions suggest a significant local rank, but they do not reveal a fully fixed hierarchy of offices.
The Serbian evidence is likewise limited. A charter of King Milutin from 1300 contains the same sequence—“sebast–praktor–knez–kastrophylax”—as the Virgin Charter. This exact correspondence strengthens doubts about the Bulgarian chrysobull, a ruler’s charter authenticated with a gold seal, and raises the possibility that it was produced to support the later Serbian act. A kastrophylax named Dragoman is also known from the reign of Stefan Dušan. Kaloyan, recorded in Antonio Barberius’s account book as kastrophylax of Mesembria, was probably not a Bulgarian official. Because the dating of the Vitosha Charter is disputed, the safest conclusion is that the office appeared in Bulgaria during the fourteenth century and was connected with the consolidation of districts governed by kephalai. The surviving evidence does not show precisely when the institution disappeared.
The name comes from the Greek καστροφύλαξ and can be rendered as “guardian of a fortress.” At first, it meant the commander of a fortified place. Later, it came to mean the main military deputy of the kephale, the governor of a town or district. So the kastrophylax was part of the local military and administrative structure. The Bulgarian documents, though, do not spell out his exact powers.
The forms “КАСТРОФИЛАКЪ” and the plural “КАСТРОФИЛАЦИ” appear in two imperial charters. In the Virgin Charter, the office is listed twice among the officials: once after the sebast, praktor, and knez, and once after the sebast and doux. In the Vitosha Charter, the kastrophylax stands right after the praktor among the subordinates of the kephale of Sredets. These placements show that the office held a notable local rank, but they do not give a fully settled order of offices.
The Serbian evidence is just as limited. A charter of King Milutin from 1300 has the same sequence — “sebast–praktor–knez–kastrophylax” — as the Virgin Charter. This exact match makes the Bulgarian chrysobull, a ruler’s charter sealed with gold, look doubtful and raises the chance that it was made to support the later Serbian act. A kastrophylax named Dragoman is also known from the reign of Stefan Dušan. Kaloyan, who appears in Antonio Barberius’s account book as kastrophylax of Mesembria, was probably not a Bulgarian official. Since the date of the Vitosha Charter is disputed, the safest conclusion is that the office appeared in Bulgaria during the fourteenth century and was linked to the tightening control of districts ruled by kephalai. The surviving evidence does not show exactly when the institution came to an end.
This was a local military job in medieval Bulgaria. It meant the guard or commander of a fortress. Later, it became the main helper of a town or district governor.
The title appears in Bulgarian charters from the 1200s and 1300s, and also in a Serbian charter from 1300. This shows it was a real and important office, but the exact chain of command is still unclear.
The safest view is that the office was used in Bulgaria during the 1300s. It was tied to the growing power of district governors. We do not know exactly when it ended.