system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar the Last Airbender] Who was Iroh’s wife?

We know he had a son (emphasis on HAD), so he must have had a wife at one point.

Who was she, and what happened to her?
gpt
We have no idea. 

There is a fan theory that she died giving birth to Lu Ten, which is one reason Iroh was so devoted to his son and devastated at his loss. It would also explain why Ursa said that Iroh was the only person in the Fire Nation royal court who was kind to her, since anyone who would marry Iroh would likely share in some of his disposition. If she was dead before Ursa married Ozai, then she wouldn't have been there. 

On the other hand, given Iroh's original position as crown prince, he might have had a strictly political marriage to a woman he had no particular affection for. Iroh said his early life was difficult, especially upon reflection later in life. So being forced into a marriage he didn't want would have fit into that, and Lu Ten was the only bright spot in all of that pain. In this scenario, it's possible that his wife left him upon the death of their son, his disgraceful loss at Ba Sing Se, and the ascent of his brother to the throne.