The subject of this essay is a previously unpublished Mystic Marriage of Saint Catherine with Saints Anne and Carlo Borromeo by Ludovico Carracci, currently in a private collection but formerly owned by the Angelelli family of Bologna. The painting can in fact be identified among the works listed as part of the Angelelli collection by Gaetano Giordani in a booklet published in 1836 on the occasion of the marriage between Prince Filippo Hercolani and Teresa Angelelli, where it is, however, erroneously attributed to Agostino Carracci. With the correct attribution to Ludovico it had instead been cited in 1812. Furthermore, it is possible to demonstrate that the painting belonged to the Angelelli family prior to 1689, when it was described, without mention of the artist's name, among the possessions of Senator Angelo Maria, who died that same year. For the face of Carlo Borromeo, Ludovico made use of a print published at the time of the saint’s canonization, decreed by Pope Paul V Borghese on November 1, 1610: an image he also used for the altarpiece Saint Carlo Borromeo in Adoration of the Holy Sepulchre at Varallo, painted between 1613 and 1614 for the Church of San Bartolomeo in Bologna. The numerous comparisons proposed by the author with other paintings executed in those same years support a similar dating for the work in question, in which Ludovico Carracci’s distinctive ability to intertwine devotional themes with expressions of familial affection, felt by him as inseparable, emerges with poignant and deeply human resonance.