Giovanni Ambrogio de Predis

Overview

Giovanni Ambrogio de Predis was the indispensable local partner for Leonardo’s first decade in Milan. Already an established court painter to Ludovico Sforza, he provided Leonardo with a residence upon his arrival and secured the prestigious commission for the Virgin of the Rocks from the Confraternity of the Immaculate Conception.

In April 1483, Leonardo and the brothers Ambrogio and Evangelista de Predis signed a contract for an elaborate altarpiece; Leonardo was tasked with the central panel, while the de Predis brothers handled the musical angels for the side panels. The relationship was dominated by a 25-year payment dispute.

In the early 1490s, de Predis and Leonardo petitioned the Duke of Milan, claiming that the original 200 ducat fee barely covered their expenses for materials. This litigation eventually led Leonardo to sell the first version of the painting elsewhere and necessitated the creation of the second version (now in London).

Technical analysis of the London panel suggests that de Predis painted large sections of it, including the "fanciful" rock formations that lack Leonardo’s geological accuracy, and the musical angels which are securely attributed to him.

As a portraitist, de Predis maintained a "conservative" Milanese style, often focused on meticulously detailed jewelry and profile views, as seen in his Portrait of a Man (Brera). However, his proximity to Leonardo led to significant stylistic merging; works like the Girl with Cherries are still debated as either his or Boltraffio's.

His role in the Sforza court provided Leonardo with the political cover needed to navigate the complex local patronage networks.

Why It Matters

Ambrogio de Predis provides the most extensive documentary record of Leonardo’s workshop collaboration; the contracts and petitions he co-signed are the primary evidence for the division of labor and financial realities of a High Renaissance studio.

Timeline

• 1482: Leonardo stays at the house of de Predis upon arriving in Milan.
• April 1483: Signs the contract for the Virgin of the Rocks.
• c. 1486-1490: Completes the side panels of musical angels.
• 1490-1494: Co-signs payment petitions to Ludovico Sforza.
• 1499-1506: Manages the ongoing litigation with the Confraternity while Leonardo is absent.
• 1507-1508: Final settlement reached; the London version is installed and paid for.after
• 1508: Last documented record of de Predis.

Key Claims

• Supported: Signed the original 1483 contract with Leonardo
• Supported: Co-authored the payment petitions to Ludovico Sforza
• Supported: Painted the side panels of musical angels
• Supported: Was a established court painter before Leonardo arrived
• Supported: Managed the 25-year litigation for the Virgin of the Rocks
• Supported: His background rocks were geologically "fanciful"
• Supported: His portraits are often confused with Leonardo's early Milan work