To some degree, the answer to this question depends on what rules system is being used to represent rulership, etc.
Birthright, for example, had bloodlines infused with the essence of gods. It also had physical manifestations of concentrated divine blood in the form of "blood jewels". The Emperor of Anuire had two crowns made (one for formal use and the other for day-to-day, just as mentioned by AFGNCAAP), each set with enormous pieces of blood jewels matching his bloodline. The crowns boosted the bloodline score of anyone with the associated divine energy in his/her blood.
In the same setting, the Elves of Tuarhievel (sp ? it has been a while) had an Intelligent throne that would kill unsuitable claimants. Claiming the rulership of Tuarhievel was a risky proposition, obviously.
Birthright, for example, had bloodlines infused with the essence of gods. It also had physical manifestations of concentrated divine blood in the form of "blood jewels". The Emperor of Anuire had two crowns made (one for formal use and the other for day-to-day, just as mentioned by AFGNCAAP), each set with enormous pieces of blood jewels matching his bloodline. The crowns boosted the bloodline score of anyone with the associated divine energy in his/her blood.
In the same setting, the Elves of Tuarhievel (sp ? it has been a while) had an Intelligent throne that would kill unsuitable claimants. Claiming the rulership of Tuarhievel was a risky proposition, obviously.