A late fourteenth-century tempera panel depicting the conversion of Saint Giovanni Gualberto, rendered in the traditional style of the Florentine Gothic period.

This panel painting by Niccolò di Pietro Gerini depicts a specific moment in the life of Saint Giovanni Gualberto, a Florentine nobleman who founded the Vallumbrosan Order. The narrative focuses on the saint's conversion, a moment often associated with his decision to spare the life of his brother's killer on Good Friday. In this scene, Gualberto is shown in a moment of prayer before a crucifix, an act that traditionally preceded his renunciation of worldly violence.

Gerini, a painter active in Florence during the late fourteenth century, adheres to the stylistic conventions of the period. The composition is structured with a clear sense of architectural space, though it retains the flattened perspective characteristic of the era. The figures are rendered with precise outlines and a focus on the decorative quality of their garments. The use of gold leaf, particularly in the halo and the background elements, reflects the standard practice for religious commissions intended for ecclesiastical settings. The colour palette is balanced, featuring soft pinks, muted greens, and the warm tones of the gilded surfaces.

This work is part of a larger series that would have originally formed a predella or a narrative cycle for an altarpiece. The attention to detail in the armour discarded on the floor and the specific facial expressions of the figures provides insight into the workshop practices of the time. Gerini was a prolific artist who maintained a busy studio, and this piece demonstrates the technical proficiency expected of a master working in the wake of Giotto. The painting offers a clear view into the devotional practices and visual storytelling methods employed by Italian artists during the late Middle Ages.