Definition of "Caxton"

I recall vividly a bright summer morning, many years ago, when, in search of Caxtons, I entered the inner quadrangle of a certain wealthy College in one of our learned Universities.

1880, William Blades, The Enemies of Books, page 37

This remarkable passion of the British nobility for editiones principes and Caxtons seems to have lasted but a couple of decades.

2011, Seymour De Ricci, English Collectors of Books and Manuscripts (1530-1930), page 43