A refined High Renaissance portrait by Giovanni Antonio Boltraffio, capturing a youth with characteristic sfumato technique and psychological depth.

This portrait, attributed to Giovanni Antonio Boltraffio, displays the technical precision associated with the Milanese school under the influence of Leonardo da Vinci. The subject, long misidentified in various historical contexts, is now widely considered to be the poet Girolamo Casio. The composition features a young man with long, wavy hair, set against a dark, atmospheric background that draws focus to the facial features and the subtle play of light across the skin. Boltraffio employs a refined sfumato technique, softening the transitions between light and shadow to create a sense of volume and presence. The subject wears a dark garment adorned with a brooch bearing the initials 'E B', which has historically sparked much debate regarding the identity of the sitter. The fine detail in the jewellery and the texture of the clothing demonstrates the artist's attention to material quality, a hallmark of his practice. The youth's expression is composed, reflecting the quiet introspection often found in portraits from this period. As a student of Leonardo, Boltraffio adopted the master's interest in psychological depth and anatomical accuracy. The painting remains a clear example of the stylistic transition occurring in Northern Italy at the turn of the sixteenth century. The use of a restricted colour palette, dominated by deep shadows and warm flesh tones, ensures that the viewer's attention remains fixed on the subject's gaze. This work provides an insight into the portraiture conventions of the era, where the sitter's status and intellectual character were conveyed through subtle gestures and carefully selected attire.