St. Collegiate Church The cross was erected in 976-986 by Bishop Notger. It contains the key of Saint. Hubert. The priceless monument is also the 12th-century Triptych of the Holy Cross (currently presented in the Curtius Museum), made of oak wood, covered with gold-plated copper. The likely author of the work is Godefroy de Huy. The triptych contains the relics of the Real Cross and the tooth of St. Vincent.
Saint Hubert's key is made of bright yellow bronze. It has a length of 37 cm and a width of about 8 cm. It is one of the symbolic keys of the Apostle Peter created in the first centuries of Christianity. His current name emphasizes the fact that the key went to the collegiate church in Liege with the help of St. Hubert (655-727).
After the French Revolution, the temple was not used for religious purposes - the cult was restored in 1802. Collégiale Sainte-Croix is on the Walloon heritage list and on the list of 67 endangered monuments of the World Monument Fund. Currently planned for many years revitalization of the church.