Cardinal della Valle is best remembered, however, as the collector of one of the first collections of Roman antiquities that marked the High Renaissance. He inherited some antiquities, which had been collected by the della Valle in the previous century, according to Vasari. and eagerly acquired more. Inspired by the Cortile del Belvedere, in 1520 he commissioned the Rafaellesque sculptor architect Lorenzetto Lotti to create a suitable setting for the sculptures and inscriptions and other antiquities that he had amassed, the result of a generation of rediscoveries at the turn of the 16th century. On the main floor of the palazzo's new second inner courtyard the sculptures were displayed in a sort of loggia, described by Giorgio Vasari as a hortus pensilis or hanging garden that included planted raised boxes and an aviary, which "blurred the distinction between garden and courtyard," with inscriptions inviting peace, relaxation and thought, an invocation of rus in urbe. The architectural framing and the great care with which the ensemble was presented— as decorative as it was scholarly, evoking Classical harmony, symmetry and equilibrium, was a model for other Roman collections. Many visitors left written impressions during the 16th century, and more than one artist made sketches.
Maarten van Heemskerck's early drawing of the loggia, showing the two famous armless satyrs supporting baskets on their heads, set against the piers of the arches, was etched by Hieronymus Cock in 1558 and circulated among connoisseurs of the Antique. Here, in the serene and ordered presentation that was eventually developed in the 1520s and 30s by Lorenzetto— Heemskerck's drawing still shows a picturesque disorder— were undertaken the first systematic restorations and completions of Roman sculptural fragments, work that, according to Vasari's anecdotes, had occasionally been undertaken piecemeal for the Medici by Donatello and Verrocchio, but which became common practice and developed into a Roman industry during the sixteenth century; Vasari, following his description of della Valle's antiquities, remarks, "And to tell the truth, these antiquities restored in this manner have much more grace than those mutilated trunks, members without heads or figures defective and incomplete in any other way". At his death the Palazzo Valle passed to his nephew, Camillo Capranica, of another antiquities-collecting family and gained the name Palazzo Valle-Capranica, while the collection was housed separately, in the palazzo of bishop Bruto Della Valle; there it was inspected by Gabriele Simeoni in 1557, who left descriptions in French and Italian. In 1584 the collection was purchased en bloc by Cardinal Ferdinand de' Medici and dispersed among various Medici dwellings. Most of the collection is at the Villa de Medici in Rome, but part was transferred to Florence, where della Valle sculptures can be seen today in the Palazzo Pitti and the Boboli Gardens, in the Uffizi, and at the Medici villa at Poggio Imperiale. A theatre was built in the Cardinal's courtyard, which gave its name to the via Teatro Valle.
