What would be Saraskos' year of birth? If he had two children by 1587, he must have been at least 18 years old, which would place his birth in 1569, the year Tarkalor succeeded Jarosar as Prince of Sartar, and his conception a year earlier. If the son he avenged was a young man at the time of his death, we need to add another generation, and that would place his birth at most a year or two after Terasarin's.
Basically, how did Tarkalor get to sire a son upon the (maybe future) Feathered Horse Queen before he became a ruler?