Thiofrid (died 1110) was the Benedictine abbot of Echternach Abbey, and writer of works in several different areas. He is one of the few medieval writers to discuss the cult of relics, in his Flores epytaphii sanctorum.
Hans-Joachim Reischmann (editor and translator) (1989), Willibrord, Apostel der Friesen: Seine Vita nach Alkuin und Thiofrid
Gernot Wieland, The Hermeneutic Style of Thiofrid of Echternach, pp. 27–45, in Sian Echard and Gernot R. Wieland (editors), Anglo-Latin and its Heritage: Essays in Honour of A.G. Rigg on his 64th Birthday (2001)
Michele Ferrari, Gold und Asche. Reliquie und Reliquiare als Medien in Thiofrid von Echternachs ‘Flores epytaphii sanctorum’, pp. 61–74. in Bruno Reudenbach and Gia Toussaint (editors) Reliquiare im Mittelalter (2005)