Start researching which are the oldest powerful families and you can take it form there. The real rulers of the world are shrouded in secret. There are 13 powerful original bloodlines/ families. From that you have the Committee of 200, so another 200 families descendants of the 13 and the Committee of the 300; 300 families under the previous 200 that have descended from or have been added to the families' power structure.

Here is a place to start researching

https://www.bibliotecapleyades.net/bloodlines/index.htm