It is a century and a half since the Book of Kells began to be revered as the supreme work of Irish calligraphy and art in the Early Christian period, and a quarter of a century since Monsieur François Masai challenged that traditional opinion, arguing that the Book was in fact made in Northumbria, apparently at Lindisfarne, or at least in some centre influenced both by Lindisfarne and Wearmouth–Jarrow – a definition which, he thought, could well apply to Iona. Masai's Essai sur les Origines de la Miniature dite irlandaise, completed in Brussels in 1944, makes no pretence to be based on research at first hand; it was written as a critique of traditional beliefs about the origins of Hiberno-Saxon illumination, with particular reference to works by Mlle Françoise Henry and Mrs Geneviève Marsh-Micheli. As such, it strikes me as a brilliant success, although some of its conclusions are false and some are not as well founded as they could have been, if Masai had revised his war-time text on the basis of a post-war examination of the manuscripts themselves. It was as a follower of Masai – his was the first book I read on Hiberno-Saxon art – that I persuaded Dr E. A. Lowe to consider, shortly before his death in August 1969, the attribution of the Book of Kells which will appear in the second edition of Codices Latini Antiquiores, part 11; and since Dr Lowe cited me as ‘an expert in this field’, I am under an obligation to publish the arguments that I advanced in 1968 and 1969, partly in letters and partly through reports which he received from his successive assistants Dr Braxton Ross and Dr Virginia Brown. The core of what I have to say is a reconsideration of a group of manuscripts, described in CLA, in the history of which Wearmouth–Jarrow had an important part to play. Lowe's devotion to the Venerable Bede and to the manuscripts produced at Wearmouth–Jarrow is well known, and I should like my lecture to count as a tribute not only to Bede's memory but to the memory of the palaeographer whose work has thrown such a bright light on the intellectual history of Bede's monastery.