Mōri Motonari
"He had three sons, Mōri Takamoto, Kikkawa Motoharu, and Kobayakawa Takakage, whom he encouraged to work together for the benefit of the Mōri clan. In one instance, he is said to have handed each of his sons an arrow and asked each snap it. After each snapped his arrow, Motonari produced three arrows and asked his sons to snap all three at once. When they were unable to do so (according to a legend still taught today), Motonari explained that one arrow could be broken easily, but three arrows held together could not."
