An international consortium of radiocarbon (14C) laboratories was established to date the origin of the St. George’s Rotunda in Nitrianska Blatnica (Slovakia), because its age was not well established in previous investigations. Altogether, 20 samples of wood, charcoal, mortar and plaster were analyzed. The 14C results obtained from the different laboratories as well as between the different sample types were in good agreement, resulting in a 14C calibrated age of 783–880 AD (94.2% probability) for the Rotunda. Although the 14C results have very good precision, the specific plateau-shape of the calibration curve in this period caused the wide range of the calibrated age. The probability distribution from OxCal calibration shows, however, that about 86% of the probability distribution lies in the period before 863 AD, implying that the Rotunda could have been constructed before the arrival of Constantine (St. Cyril) and St. Methodius to Great Moravia. The Rotunda thus probably represents the oldest standing purpose-built Christian church in the eastern part of Central Europe.

中文翻译：

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ST的放射性碳约会。乔治在 NITRIANSKA BLATNICA（斯洛伐克）的圆形大厅：国际财团结果

国际放射性碳联盟（14C) 实验室的建立可以追溯到 Nitrianska Blatnica（斯洛伐克）的圣乔治圆形大厅的起源，因为它的年龄在以前的调查中没有得到很好的确定。总共分析了 20 个木材、木炭、砂浆和石膏样品。这14从不同实验室以及不同样品类型之间获得的 C 结果非常一致，导致14C 校准圆形大厅的年龄为公元 783-880 年（概率为 94.2%）。虽然14C结果具有很好的精度，该时期校准曲线的特定平台形状导致校准年龄范围较宽。然而，来自 OxCal 校准的概率分布显示，大约 86% 的概率分布位于公元 863 年之前的时期，这意味着圆形大厅可能是在君士坦丁（圣西里尔）和圣梅多迪乌斯到达 Great 之前建造的摩拉维亚。因此，圆形大厅可能代表了中欧东部最古老的专门建造的基督教教堂。