Yes, the Caravelle was the first jet airliner to perform an autoland (September 1962), and thousands were made in tests, and Cat II and Cat IIIA approval well before the Trident.
Certification cleared the use of autopilot to a DH of 15m/50ft (Cat IIIA) -- because of the single-channel autopilot -- so it was a manual flare (with automatic help in the lateral plane and auto-throttle).
The Trident went on to Cat IIIB in 1975.
(The first commercial aircraft to make a ground-controlled automatic landing was the Boeing 247, in 1944; however, in England and flown by a RAF pilot.)