A refined seventeenth-century engraving by Gérard Edelinck, depicting the French mathematician Guillaume François, Marquis de l'Hospital.

This engraving by Gérard Edelinck depicts Guillaume François, Marquis de l'Hospital, a French mathematician known for his work on infinitesimal calculus. The portrait follows the conventions of late seventeenth-century French printmaking, presenting the subject within a formal oval frame set upon a stone-like plinth. Edelinck, a master of the burin, employs precise hatching and cross-hatching techniques to render the textures of the Marquis's voluminous periwig, the fabric of his coat, and the subtle modelling of his facial features.

The composition is balanced and restrained, typical of the period's approach to aristocratic portraiture. The Marquis is shown in a three-quarter view, his gaze directed towards the viewer with a calm expression. His hand rests near the buttons of his coat, a gesture that adds a sense of naturalism to the formal pose. Below the oval, a coat of arms is integrated into the architectural base, which also bears an inscription detailing the subject's titles and lineage. This inclusion of heraldry and text reinforces the status of the sitter, aligning with the practices of the era where portrait prints functioned as both personal records and displays of social standing.

Edelinck's technical skill is evident in the variation of line weight, which creates a sense of depth and volume without relying on excessive shading. The background within the oval is treated with a fine, uniform texture that pushes the figure forward, ensuring the Marquis remains the primary focus. This print offers a clear example of the high standards of reproductive engraving in the court of Louis XIV, where artists like Edelinck were commissioned to translate painted portraits into widely distributed prints. The work remains a fine example of the intersection between scientific achievement and aristocratic representation in the late Baroque period.