This is very doubtful. Fra Angelico's brother Fra Benedetto da Fiesole was a scribe rather than a miniaturist, and probably only wrote the fine large text; the illuminations were probably added by a pupil of Fra Angelico, named Zanobi Strozzi, who died in 1468.
As an example of this I may mention Fra Angelico's system of painting the shadows of drapery in pure colour, using the same colour mixed with white for the rest of the folds. To some extent this method was used by the Sienese school of painting, which in other respects resembles in style the miniatures in illuminated manuscripts; see above, p. [114].
Taking it all round, in painting, sculpture, the medallist's art and other branches of the fine arts, no country and no period except Athens in the time of Pericles can ever have quite equalled the artistic glories of Florence under Cosimo the Elder and Lorenzo de' Medici.
Pontificals contain such Services as only Bishops or Archbishops could celebrate, and therefore comparatively few would be required.
A beautiful manuscript of about 1460 in the Fitzwilliam Museum has its first page surrounded with a border of this class of design, the interest of which is much increased by the minutely written signature, "Jacopo da Fabriano," introduced among the leavy ornaments of the margin.