Possible Queen of the Horus Ka. This is a personage I admit I'm still researching, I came across a mention of a Queen Ha within W.M. Flinder Petrie's A History of Egypt: From the Earliest Times to the XVIth Dynasty and it was the first and, to date, only reference I've seen mention a Queen Ha. Within Petrie's tome, he references excavations of the tomb of the Horus Ka and in specific, several cylinder jars of pottery that were found with inscriptions. One such inscription read, "Ha, wife of the Horus Ka". He also provides an image of the serekh of Queen Ha which does differ slightly from Ka's serekh.

Due to the fact that there can be some confusion with the early serekhs, especially when drawn in a less than rigid form, I'm still keeping my options open regarding whether or not this was an actual Queen or a misinterpretation of the serekh. However, I did think it worthwhile enough to note here and will update this information should I find any references that either confirm or deny her existence.