From the introductory note to this entry:
According to the life written by Aimoin (PL 139.387–414; BHL 3), Abbo, born in the Orléanais ca. 945, was an oblate at Fleury (Saint-Benoît-sur-Loire) and later studied in Rheims and Paris. He may have been present at the synod of Winchester (ca. 973; see Knowles 1963 p 46 note 3 and the REGULARIS CONCORDIA, ed. Symons and Spath 1984 p 72). He became master of the monastic school at Fleury, but, apparently disappointed by the selection of another to be abbot (Mostert 1986), he ac­cepted an invitation to teach at the recently established abbey of Ram­sey; he remained in England from late 985 to the autumn of 987. He returned to Fleury to become abbot in 988, proving to be an active sup­porter of the Cluniac reform and opposed to the power of the bishops. He was killed at La Réole (Gascony) in 1004. An epitaph survives (MGH PLAC III.344; ICL 5795), and he was venerated as a martyr during the Middle Ages. For further discussion of his life, see Cousin (1954), Mostert (1987 pp 40–64), Engelen (1993 pp 3–4), Schupp (1997 pp xi–xviii), BEASE p 3, and DMA 1.12–13. On the importance of Fleury at this time, see, for example, Pel­le­grin (1984–85). On his influence on DUNSTAN, ÆLFRIC, and BYRHT­FERTH, this last his pupil at Ramsey, see John (1983 pp 300–06) and Baker and Lapidge (EETS SS 15 pp xx–xxiii and xliii–xlv). For further evidence of the cultural traffic between Fleury and English abbeys, see Vezin (1977), Gransden (1995 p 23 note 25), and BEASE pp 187–88.

Setting out Abbo’s works is complicated by several related problems. Some, most notably the Computus, lack critical editions while others remain unedited. Moreover, since some are quite brief yet on related topics, it can be difficult to determine which should stand alone. These problems are further complicated by the differing titles that appear in the manuscripts and thus in the scholarship: the more common, but not all, of these variant titles are listed with cross-references.

The individual entries below begin with two works closely asso­ciated with Abbo’s time in England, the Passio Eadmundi and the Quaestiones grammaticales, and then turn to the Computus that he would have brought with him to Ramsey. Following these entries are sections, with individual entries arranged alphabetically, on his other Mathe­mati­cal and Astronomical Tractates and his Poems. The only letter by him known in Anglo-Saxon England is the one to Dunstan at the beginning of the Passio Eadmundi. While many questions about the chro­nology of Abbo’s works remain (see Evans and Peden 1985 pp 109–10), it appears that during the period of his abbacy his interests shifted from scientific to political matters; these later works, set out by Sharpe (HLW 1–4), are not currently known to have circulated in Anglo-Saxon England. The request of abbot WULFRIC of St Augustine’s (ed. RS 63.409; see Van de Vyver 1935 p 165 note 1) for a verse counterpart to a prose work on Dunstan (B’s Vita Dunstani: see ACTA SANC­TORUM, Dun­sta­nus) may serve as a reminder not only of continued interest in the opus gemi­natum in England, but also of the continued contact between Abbo and the Anglo-Saxons, which could have led to knowledge of his later works.

Finally, since much uncertainty about Abbo’s actual oeuvre—par­ticu­larly his poems and shorter tracts—remains, it seems premature to create a separate section for Pseudo Abbo. There are, therefore, entries here on two poems, In patris natique sui and Terminat Hyginus, that Lapidge and Baker (1997 p 10) consider to be by a follower. An entry on De quinque zonae caeli is also included with other astronomical tracts because Bober (1956–57 pp 67and 93) considers it “Abbonian.” For other works associated with Abbo but not individually catalogued by Sharpe (HLW 1–4), see the introductory remarks to the two sections below.