It's not an obvious pairing - the hero of Babylon 5 from the second season on, and the hero of Trafalgar. I recently discovered something that interested me, though. Before Lord Nelson commanded the Victory, his favourite ship as a Captain was the 64 gun Agamemnon. The ship was present at the Battle of Copenhagen (where she ran aground) and Trafalgar - and she was later wrecked at the mouth of the River Plate in South America.
When Captain Sheridan first showed up at Babylon 5, craving fresh oranges and a water shower, he was in command of the Agamemnon.
Somehow, I don't think it's a co-incidence.