Annus Trabeationis

Sir Harris Nicholas, in his Chronology of History, p. 4., gives "annus Trabeationis" as one way in which the year of our Lord is designated in ancient documents. Would any of your readers favour me with the meaning of the word Trabeatio? [Our correspondent will find, on referring to Mr. Hampson's useful work, *Medii Ævi Kalendarium*, vol. ii. s. v. Annus Trabentionis, "According to Du Cange, this is the year of the crucifixion—'Annus Trabeationis Christi (annus quo Christus trabi affixus est);' but according to *L'Art de vérifier les Dates*, it is the same as the year of the Incarnation." Mr.…