Aireen?

Daughter of Aeril - Wife of Caladog

Aireen or maybe Tasiel. See bottom for why she might be named this.

Daughter of Former High King Aeril - the wife of Caladog - and the mother of his children, Mengus, Corein and Merag is unknown. She married Caladog and became part of fen Gruffendoc but was originally in fen Uthelhain with her father. Ergeon is her uncle.

We hear nothing of her from the game's lore or from the free companion dlc but I believe she could possibly be Tasiel from the Digital Companion.

However, considering the appearance of Ergeon (her father's brother) and the children that she had with Caladog a rough idea of what she may have looked like can be pieced together.

Corein has green eyes and dirty blonde hair (the only one to possess them in her family) and she and Mengus have straight hair as opposed to Caladog and Merag who have curly hair. Using Ergeon, Corein and Mengus as reference points this could be what she may have looked like. Aged to 38, assuming she has Mengus at 18. Making her 1 year younger than Caladog.

According to the lords.XML there's a character in the Battanian section, specifically in the fen Gruffendoc section named Aireen. She's been removed but is labeled as a wife of someone. Could be Muinser's wife but I think she's Caladog's missing wife. The file states Aireen is "surprisingly gentle and a compassionate wife, to whom he is devoted".