This was written by Sylvia Fricker in 1962. She and her husband-to-be Ian Tyson, performing as Ian and Sylvia, recorded it for their 1964 album Northern Journey.
In 1965 it was covered by We Five and got to No 3 in America.
In 1966 Crispian St Peters (born Robin Peter Smith) reached No 2 in the UK and No 36 in the US with his version, which I think is the best.