I've seen several books (e.g. Byzantine Empresses by Lynda Garland) as well as the Encyclopedia Britannica claim that Empress Irene was considered a saint. Britannica even lists a feast day. However, Wikipedia claims that this is a misconception, and I wasn't able to find her listed in any list of Orthodox saints.
Could anyone provide a definitive answer to this?
The confusion may arise from the fact that Empress Eirene (Piroska), the wife of John II Komnenos, was canonized as a saint. As far as I am aware, Empress Eirene of Athens was proclaimed by one or two authors to be a saint, but was never officially canonized. I believe Wikipedia is correct in its claim.