Adjective
Cottonian (not comparable)
Of or relating to Sir Robert Cotton, 1st Baronet, of Connington (1571–1631), antiquarian and bibliophile whose Cotton library became the basis of the British Library.
A much more substantial survival from Old Cornish is a Cornish-Latin glossary (the Vocabularium Cornicum or Cottonian Vocabulary) containing translations of around 300 words. Source: Internet