Validar is the father of the Avatar and grandfather of Morgan and can potentially be the grandfather of any of the given future children.
Validar is the leader of the Grimleal, the religious sect worshipping Grima in Plegia, and is trying to expand Plegia by force. Validar's main goal is to resurrect Grima as his forefathers had tried, albeit unsuccessfully. Like his forefathers, Validar was born in hopes of being a suitable vessel but, also like them, he too was unworthy. Eventually, Validar had a relationship with an unknown woman, presumably to continue Grima's lineage. This ultimately accumulated in the birth of a child who finally had the Heart of Grima symbolized by the Mark of Grima on their right hand. However, fearing for her child's future, the woman took the baby and left Plegia to protect them. Validar spent many years afterwards searching in vain for his child.