10 Mind-Blowing Facts You Didn't Know About Babylon 5
3. Delenn Originally Married Sinclair

In the original outline for Babylon 5, Delenn married Commander Jeffrey Sinclair. However, J. Michael Straczynski began to feel that everything he wanted Sinclair to do throughout the course of show was a bit too much for one person to handle. This led to the decision to introduce Captain John Sheridan.
Straczynski decided to divide some duties between Sinclair and Sheridan, and one of the responsibilities that went to Sheridan was the role of Delenn's husband. So while many people believed that Sheridan was introduced as a replacement for Sinclair when Michael O'Hare left the show after season 1, the reality is that Sheridan was supposed to appear anyway to assist Sinclair, not replace him.