Guccio di Mannaia

[4] In addition, he seems to have been familiar with northern European artworks, such as the Westminster retable in England and the miniatures in illuminated manuscripts of the Parisian Master Honoré, to which the human figures in his work are often compared.

[9] Guccio di Mannaia's only signed work is a chalice "of extraordinary importance and quality"[2] made in 1288-1292 at the request of Pope Nicholas IV for the Basilica of Saint Francis in Assisi.

It contains technical details including finely wrought repoussé leaves with other metalwork features that mark it as "Tuscan Gothic";[1] both its form and technique were widely copied.

The range of enamel colors includes azure, violet, yellow-gold, green, brown, and blue, and in various places the chiselling and engraving of the metalwork reveals the silver underneath the gold plating.

[12] His signature (Guccius Mannaie de Senis fecit) as well as the name of the commissioning Pope (Niccholaus Papa quartus) are contained in sixteen of the enamels that circumscribe the chalice’s stem.