The date of Calimehtar's birth appears only in The History of Middle-earth volume XII, The Peoples of Middle-earth. It cannot therefore be considered completely reliable.
2
After Calimehtar's time, his son Ondoher died in battle with both his heirs. In the same battle, Ondoher's nephew Minohtar was also lost; he was a grandson of Calimehtar through an unnamed daughter.