It was the two Orcagnas who, according to Vasari, had covered the Choir with those scenes in the life of the Virgin which Ghirlandaio was allowed to paint over, and Vasari adds that the later artist availed himself of many of the ideas of his predecessors.

This, however, is not very likely, I think, except perhaps in choice of subject.

Orcagna, like Giotto, and later, Michelangelo, was a student of Dante, and the Strozzi chapel frescoes follow the poet's descriptions.

In the Last Judgment, Dante himself is to be seen, among the elect, in the attitude of prayer.

Petrarch is with him.
The sacristy is by Talenti (of the Campanile) and was added in 1350.