For decades, historians suspected that the ruined crusader Fortress in southeastern Transylvania was built by the Teutonic Knights during their brief stay in the region. Now, a new scientific study has provided the strongest evidence yet to support that theory.
Researchers reporting in Archaeological and Anthropological Sciences found that the fortress’s earliest stone defenses date to the early 13th century. The results match the period between 1211 and 1225, when the Teutonic Knights controlled the Burzenland region, known today as Ţara Bârsei in central Romania.
The findings offer rare physical evidence of the military-religious order’s activities in Transylvania and help resolve a long-standing historical debate.
A frontier stronghold on the edge of medieval Hungary
Feldioara, also known by its German name Marienburg, stands on a plateau overlooking the Olt River with views toward the Carpathian Mountains. During the Middle Ages, the area formed part of the southeastern frontier of the Kingdom of Hungary, bordering lands controlled by the nomadic Cumans.
Historical records show the site was known as Castrum Sanctae Mariae by 1240, when it was granted to the Cistercian Order. Its association with the Virgin Mary has long fueled speculation about a connection to the Teutonic Knights, whose order was dedicated to Mary.
Written sources confirm that King Andrew II of Hungary invited the Teutonic Knights to settle in the region in 1211 to strengthen the kingdom’s frontier defenses. Archaeologists previously uncovered medieval walls, a church, towers, and military artifacts at Feldioara. However, researchers lacked direct evidence linking the fortress’s stone structures to the knights’ short occupation.
Mortar dating provides crucial evidence
To investigate, the team analyzed 13 lime mortar samples collected from some of the site’s oldest masonry during excavations conducted between 2013 and 2017. Mortar is difficult to date because it hardens gradually as it absorbs carbon dioxide from the atmosphere and can be affected by later repairs.
Researchers examined microscopic calcite particles within the mortar and used radiocarbon dating combined with statistical modeling. Several samples from the fortress’s earliest defensive walls and the foundations of a western tower produced dates that matched the Teutonic period.
The study concludes that Feldioara’s first stone fortifications were built while the Teutonic Knights governed the region.
A glimpse into the order’s early ambitions
The findings also shed light on the order’s broader ambitions. Founded during the Third Crusade as a hospital organization for Christian pilgrims, the Teutonic Order later became one of medieval Europe’s most influential military powers.
Its relationship with the Hungarian crown deteriorated after the knights expanded beyond their original mandate and sought greater autonomy. King Andrew II expelled the order from Transylvania in 1225 after just 14 years in the region.
Although their presence was brief, the new evidence suggests the knights left a lasting mark on the frontier landscape. Researchers say Feldioara represents one of the earliest surviving examples of the Teutonic Order’s strategy of combining border defense, fortified settlements, and political influence.
The approach would later be used on a much larger scale in Prussia and the Baltic region, where the order established its most powerful territorial state.
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