). Two writing-tablets fastened at the back by
wires upon which, as upon hinges, they opened and shut. They were also
known as pugillares.
When three or more tablets are joined they
are called triptycha
details see Writing and Writing
The Diptycha Consularia, frequently mentioned in the
later times of the Empire, were made of ivory, and were presented by the consuls to the
emperor and to their friends on the day on which they entered upon their office. Other
magistrates, such as the quaestors, also distributed diptycha on the same occasion (Symmach.
Ep. ii. 81
). These diptycha contained the portraits and names of the
consuls, with other representations in bas-relief. Several of these diptycha are still
extant—sixty-one in all, according to Marquardt—the earliest bearing the
date of A.D. 406 and the latest of 541.