In the 2350s, Endar fought against the Federation in the Galen border conflict. In 2357, Endar fought Humans on Galen IV. In the aftermath of the battle, he claimed the surviving son of the dead Connor and Moira Rossa in return for the loss of his son, who was killed fighting Humans on Castal I. This was in accordance with Talarian tradition, but in contradiction with their agreements with the Federation. The boy was given the name Jono and raised as a Talarian.
In 2367, Jono was discovered wounded in a Talarian observation craft by the USS Enterprise-D. Endar reached the Enterprise-D and demanded the return of Jono. Captain Picard accused the Talarian of abusing the boy, but Endar denied the charge, telling Picard that the boy had been injured performing Talarian rites of passage. Picard allowed Endar to see Jono, but refused to surrender him. Endar threatened war and announced that additional Talarian ships were en route. Picard decided that Jono would be better with Endar than trying to adapt to Human ways after ten years being raised as a Talarian. (TNG: "Suddenly Human")