The apparent inconsistency in the name of the wife of Duke Elrad is still there:
[chronology, p31; "6029: Birth of Kalen Avanir, son of Duke Elrad and Irisa Avanir]
[chronology, p43; "Winter 6057 1.1 [The Duke of Prevan's Enven wife Isil becomes pregnant" and
chronology, p45; "Fall 6057 Isil gives birth, it is a girl]
Dukes and Courtesy Titles, p68 "When Isil Aliouné married the Duke of Prevan (...)"
The Dukes / Kaytha, p72 "+ Her Grace Isil Irellion Avanir, the Duchess of Prevan]
It looks like Isil is indeed the Duchess of Prevan and Elrad's wive. The chronology p31 seems incorrect (mistake between Isil and Irisa, which is also mentioned in Chronology p30 "5970: [birth of Erlin twins Irisa and Irina on the isle of Veriadar, off the SE coast of Urulan] and p31 "6031: During a solar eclipse and conjunction, Irina of Veriadar (now living in Prevan under the care of her sister) awakens (...)]"
The only problem is that the above fits with Irisa being Elrad's wife and the fact that Jad Hurok (Irina's son) is good friends with - and the squire of - Kalen Avanir. Furthermore, the text p65 indicates that Jad is indeed Kalen's cousin.
Isil = Irisa ? It would solve everything. You just need to choose which name is the correct one and search/replace the other
Unless Irisa died between 6029 and 6057 and Elrad remarried... once again with an elf ? I know Elrad does not want to play the political games of the court (and thus would likely marry whoever he wants, consequences be damned), but I was not under the impression that elves were that welcome in Rhakhaan.