many is the
There are or have been a large number of. Many is the night I've spent regretting what I did to my brother.
many is the
There are a great number of, as in Many is the time I've told her to be careful, or Many is the child who's been warned against strangers. This phrase, always used at the beginning of a sentence and with a singular noun, was first recorded in 1297. Also see many a.