Claim: The Cancioneiro da Vaticana is a compilation of troubadour lyrics that was discovered in 1840 in the holdings of the Vatican Library.
Evidence: It was discovered c. 1840 in the holdings of the Vatican Library and was first transcribed by D. Caetano Lopes de Moura in 1847, sponsored by Viscount of Carreira, and again by Ernesto Monaci in 1875. Circa (from Latin 'around, about, roughly, approximately') – frequently abbreviated ca. or c. and less frequently circ., cca. – signifies "approximately" in several European languages and is used as a loanword in English, usually in reference to a date.