D Majuscule avec chapiteau

Capital D with capital. There are many capitals with architectural frames in this manuscript. This one is uniquely rendered in perspective.

Lucii Annaei Senecae epistolarum libri viginti duo : praemittitur authoris vita.
Source: gallica.bnf.fr

Bibliothèque nationale de France, Département des manuscrits, Latin 8551, fol. 30r.