J. Henry Middleton, Illuminated Manuscripts in Classical and Mediaeval Times… (1892)
“ Late survivals. Late survivals of writing on tablets. Before passing on to describe other forms of classical manuscripts, it may be interesting to note that the ancient waxed tablets or pugillares continued to be used for certain purposes throughout the whole mediaeval period, down to the sixteenth century or even later. Many of the principal churches, especially in Italy, but also in other countries, possessed one or more diptychs on which were inscribed the names of all those who had in any way been benefactors either to the ecclesiastical foundation or to the building. ”
