Continuing through the alphabet of collections we come to U. For the previous collections see A and B, C through N, O through R, and S.

Urb - Urbinati - Federico da Montefeltro (1422-1482), illigitimate son of Guidantonio da Montefeltro, was a Condottiero and Lord, later Duke, of Urbino and one of the most prolific book collecotors of the 15th Century. In this case "book" means "manuscript" as of the more than 900 volumes in his library at his death, all were "superlatively good, and written with the pen, and had there been one printed volume it would have been ashamed in such company."¹, according to Vespasiano da Bisticci, who had assisted the Duke in growing his collection.

The collection transfered to the Vatican during the reign of the last lord of Urbino, Francesco Maria II Della Rovere (†1631). Unusually the collection as it transfered was mostly intact, although until the end of the 18th Century it was not considered "closed" and manuscripts from unrelated sources continued to be added. There were six Arabic manuscripts in the collection that are shelved in Vat.ar today.

For the librarian, this collection has the added appeal of several catalogues. The first, the so called Indice vecchio was created by Agapito of Urbino just after Frederico's death.

• ebr - ebraici - 59 MSS. These are catalogued in ריצ׳לר, בנימין, מלאכי בית־אריה, נורית פסטרנק, מכון לתצלומי כתבי־היד העבריים, Benjamin Richler, Malachi Beit-Arié, Nurit Pasṭernaḳ, Biblioteca apostolica vaticana, and Makhon le-tatslume kitve-ha-yad ha-ʻIvriyim. Hebrew Manuscripts in the Vatican Library: Catalogue. Studi e Testi (Biblioteca Apostolica Vaticana) 438. Città del Vaticano: Biblioteca apostolica Vaticana, 2008. Online here. Due to the religious practice, there is no figural art in much of the Hebrew collection, but there are many examples of micrography, such as the dragon at the bottom of this page from Urb.ebr.1, f.3v
• gr - graeci - 165 MSS. Five of these were digitized as part of the Polonski Foundation project to digitize Greek manuscripts.
• lat - latina - 1,779 MSS. This collection includes codices in Italian as well as multi-lingual texts containing Latin, for example the tri-lingual Latin, Greek, and Hebrew Psalter, Urb.lat.9 (see f.1r to the right, including Federico's arms at the bottom). It includes many works comissioned by Federico himself, including one of the finest copies of Dante's Comedy ever made, Urb.lat.365, modernly known as the Dante Urbinate.

Notes

1. http://www.italianrenaissanceresources.com/units/unit-4/sub-page-03/vespasiano-da-bisticci-praises-the-library-of-federigo-da-montefeltro/
2. https://www.facsimilefinder.com/articles/library-federico-da-montefeltro/
3. https://spotlight.vatlib.it/humanist-library