People today think that kings and queens were just any lucky boob wearing a crown. I think some of them could be described as such, but the thrones they sat on were established by a different kind of person.
It goes back to homozygosity. In the eastern monarchies and emperial lines certain traits were known to mark a person with the kind of skills neccessary to organize a group of related people. The whole kingdom was connected through these blood relationships. People with certain traits could encourage the cooperation of others because it would actually seem natural. Of cource affairs happen and bloodlines get obscured and kingdoms dont stop on a dime. Sometimes a kingdom would skid long enough on imposters that the rift could be fixed and a real king or emperor would emerge, sometimes the empire or kingdom would fall.
When a kingdom would fall, people would sometimes try to rekindle the line, or an emperor would be there but too young to generate cooperation.
When the men are not sufficently homozygous enough to be emperors, women have an extra x chromosome which tips the scale in our favor. Sometimes there can be both an emperor and an empresss in existance at the same time. If its a Japanese emperor and a Chinese empress, they have in the past married, though in the past the chinese empress doesnt ascend to rule china. This is because there is also a chinese emperor around. Chinese empresses never marry chinese emperors, though in the past kings and queens married. Emperors and empresses are usually a multi lined construction of an assembling of groups in a territory with sufficeint homozygosities from each group to be able to relate to them all enough to rule them fairly. This makes the Japanese emperor more of a king except that he is descended of many chinese empresses. He is not an emperor of china though he could rule china as a japanese emperor but it wouldnt be regarded as domestic rule. At this time there are atleast two japanese emprial lines, but we swap children, I dont believe anything legitimate is being done in the chinese emperial lines anymore. There is no chinese emperor right now, there is a chinese empress who is bonded to an offshore emperor. The off shore japanese are regarded as a western chinese ethnic group to a certain extent. If this designation became more defined, there could emerge a territorial ruler, however right now, this couple of both of us are communists sort of.
Homozygosity with sufficient diversity and a full deck of genes is what leads to long life span. There isnt a long life gene, there is a long life genetic configuration. The stories about the chinese kings living a very long time are true.
Each of the kingdoms had a complete line until the King of Qin went haywire and killed everybody. The pieces can be put back togeather to make one line, and we are working on it.
Im not that union. Im actually only comparatively the empress of china and in former eras I would have been a minor noblewoman. Im just the best we got. But my multi directional homozygosities extend beyond chinese and japanese groups though peoples like the original arabs no longer exist.