Xanitla was a major Romulan agricultural colony.
In 2381, protests took place on Xanitla in which the participants demanded the end to the split between the Romulan Star Empire and the Imperial Romulan State. (ST - Typhon Pact novel: Rough Beasts of Empire)
In 2383 Proconsul Tomalak launched an attack against Donatra's forces here, but was soundly trounced. The next year Praetor Tal'aura forced him into early retirement for this defeat. (STO website: The Path to 2409)