Applying archaeomagnetic methods to virtually reconstruct medieval pavements: Insights from Tiebas Castle (Spain)

Abstract

Archaeomagnetic dating is commonly applied to baked clay materials. Through these methods, the chronology is calculated by analysing the material's remanent magnetism and knowing its original position. Here, the reverse approach was applied: knowing the chronology and remaining magnetism, the original orientation was virtually reconstructed. This reverse method was tested on some tiles from Tiebas Castle (Spain) proving novel insights of its pavements. The object of analysis was a set of tiles that had been heated twice: first during their manufacture in the mid-13th century, and after, during the castle destruction by a fire in 1378, when they were part of the pavement. Through these results it was determined which halls were covered with tiles and to estimate their original orientation in them. Additionally, it has been possible to estimate the temperatures reached during the fire (240–540 ºC). This novel application demonstrates potential for broader use in reconstructing archaeological ceramic structures like kilns, ovens, or pottery.