The Polyhymnia of Cortona

There are various references to Cortona in the notes of Leonardo, who studied the river that flowed past the city. The town’s Biblioteca Etrusca owns a 16th-century edition of Leonardo’s Libro di Pittura, while the Museo dell’Accademia has in its collection an interesting artifact known as the Musa Polymnia, a sketch on a piece of slate (date contested), which Leonardo may have seen and drawn inspiration from for his own encaustic technique.