Can someone point me to the earliest source that contains the melody for Adoro te devote? I've checked on the Cantus Index, as well as MMMO database and have not been able to find anything on this hymn. I want to view the document. If you don't know the earliest one, can you point me to an early one? I'm guessing it would be 18th century.
The lyrics for Adoro te devote were composed by St. Thomas Aquinas. CPDL says the following about this hymn:
Eucharistic hymn (Meter 11 11. 11 11) attributed to Thomas Aquinas, with notable English versions by J. R. Woodford (whose version is in 10 10. 10 10 meter), John Mason Neale and Gerard Manley Hopkins. The traditional tune appears in the 1697 Processionale Parisiense pp. 192-3.
See Torrell, O.P., Saint Thomas Aquinas (vol. 1): The Person and His Work, ch. VII, § "The Office of Corpus Christi", §§ "The Adoro te" for details about its authenticity.