サン・ジョバンニ・イン・ラテラノ大聖堂
Portions of the relic were extracted and taken by Charlemagne to the St Chapelle in Paris, and later to the Weingarten Abbey, to the Archbasilica of St. John Lateran in Rome, and to the Church of the Holy Cross in Guastalla (built on behalf of Beatrix of Canossa).