Titus Lucretius Carus - De Rerum Natura (On the Nature of Things)
Biblioteca Malatestiana in Cesena. Unfortunately I don't know how old this copy is.

Neume initial
Biblioteca Malatestiana, Cesena.

The Resurrection by Piero della Francesca
The Resurrection by Piero della Francesca. A detail. Museo Civico, Sansepolcro.

San Brizio Chapel, Orvieto Cathedral

Saint Blaise
Saint Blaise (1500s) by Girolamo di Benvenuto. Palazzo Ducale, Urbino.

Madonna with Child
Madonna with Child (1476) by Alvise Vivarini. Palazzo Ducale, Urbino.

Flagellation of Christ
Flagellation of Christ (1460) by Piero della Francesca. Palazzo Ducale, Urbino.

Flagellation of Christ
Flagellation of Christ (1460) by Piero della Francesca. Palazzo Ducale, Urbino.

Institution of Eucharist
Institution of Eucharist (1473-1476) by Joos Van Wassenhove (Giusto di Gand) and Corpus Domini predella (1467-1468) by Paolo Uccello. Palazzo Ducale, Urbino.

Madonna with Child by Vincenzo Pagani
Madonna with Child and Saints Martin, Michael and George (1529) by Vincenzo Pagani. Palazzo Ducale, Urbino.