What is "ulans"

Usage examples of "ulans".

Did not Vulcans and Rom ulans have just such features, except for the missing horns?

Announcements resonated from speakers set all about the courtyard, stating--warning--that Dralath, Praetor of the From ulans, would shortly be making a proclamation, "One to stir the blood and cheer the heart of every true Romulan.