Par. gr. 2552 containing grammatical writings, has sofar been dated to 1496. But this is incompatible with its presumed provenance from the Venetian Barbaro library. Palaeography, watermarks and historical information show that the correct date is 1466 and that the copyist, a Hilarion monachos, is the Benedictine literate Niccolò Fontanelli, alias Ilarione da Verona (ca. 1444-ca. 1485). Urb. lat. 737, which contains a poem of his in Greek dedicated to Bessarion, turns out to be an autograph.