Between 2001 and 2003, several archaeological projects were carried out on Plateau du Saint-Esprit in Luxembourg City, at the very site of the medieval monastery of the Holy Spirit. This archaeological research became necessary because several buildings of the new judicial precinct were going to be constructed at this very spot. It allowed an extensive archaeological study of this ancient religious building.

The excavations of the monastery church revealed elegant carved stone ornamentation, and the earth banked near the northern triumphal arch in front of the chancel yielded several carved fragments later found to be quite exceptional. Among them were the legs of a man in a suit of armour standing on a roaring lion with an undulating mane and lying on the ground looking back. The edges of the monument are inscribed in Latin “... T : GENEROS(US) : DNS (dominus) : CLAUDI(US) : DE : NOVO : CASTR(O) ...“ (Muller, 2011).

The inscription allowed archaeologists to identify the sculpted elements without the shadow of a doubt as the lower part of the tomb of Claude de Neufchâtel, Lord of Fay and Grancey, Lieutenant-General of Luxembourg and Burgundy, acting governor under Charles the Bold, Duke of Burgundy. Claude de Neufchâtel, Knight of the Golden Fleece, died on 24 February 1505 and was buried in the Church of the Holy Spirit.