Living with a historian

Someone was talking about the origin of Valentine's Day, so I asked Thad if it was accurate:

The story I heard dates from the third century when Rome was ruled by the Emperor Claudius II. It tells how the Emperor outlawed marriages for young men because he felt single men were better soldiers then men who were married. A priest, named St. Valentine, didn't agree with the Emperor and married young lovers in secret. When the Emperor discovered what St. Valentine was doing, he sentenced him to death. While St. Valentine was in prison, waiting to be put to death, he met and fell in love with the jailor's daughter. Before he died he sent her a love letter and signed it "From your Valentine". This expression is still used today and now St. Valentine is best remembered as a romantic and heroic figure.

He said:

The story is complete baloney.
1) No roman soldiers were coming from Rome in the 3rd century.
2) Any emperor who outlawed young men getting married would be an idiot.
3) Even in 496, the pope Galatius knew nothing at all about St. Valentine.
4) The story about the daughter, etc, was created in 1290 by a poet named Jacobus in his Legenda Aurea, golden legend.
5) The story about, "From your valentine" is a modern creation.

So now you know at least one version that has been debunked. Lucky for me I get to hear a lot of theories debunked. Oh those historians...