Once  in Rome, where he was to remain for ten years, Matal continued to explore and catalogue libraries,  and to transcribe texts;  these interests remained with him, exemplified when in 1564 he had access to and commented on an elegant ninth-century manuscript of the Gromatici.
 Pal. Lat. 1564: 'Veterum aliquot auctorum de agrimensoria collectio': the letter at the end from Matal to Jo. Echtius (Johann Bachoven von Echt, 1515 to 10 January 1576), Cologne, 1564, is published in C. Thulin, Abhandlungen der preussischen Akademie der Wissenschaften, 1911, Anhang II, pp 1–102, 'Die Handschriften des Corpus agrimensorum Romanorum'. Matal considers that this MS gives a more complete text than that on which the 1554 Paris edition of Turnèbe and Galland was based; cf. Hobson, 'Iter italicum', (n. 13 above), p, 61, n. 109.