Final answer:
The concept of a 'pure' royal bloodline is controversial and not easily defined. Historical examples like the Silla kingdom in Korea show attempts to maintain purity, but over time, such systems became unsustainable. Modern monarchies like the British, Japanese, and Saudi royal families trace their lineage back many generations, yet 'purity' remains a symbolic notion.
Step-by-step explanation:
When discussing whether there is any royal bloodline that is still 'pure,' it's important first to understand that the concept of a pure royal bloodline has been both historically valued and challenged. The desire to maintain a 'pure' royal line often led to practices such as intermarriage among royalty, which could have adverse consequences on health and political stability. However, the idea of blood purity is quite controversial and its validity is debated among historians and genealogists.
As an example, the historical Silla kingdom in Korea had a bone-rank system where the 'holy-bone' (or 'sacred bone') class was considered the purest and often led to the rulership of the kingdom. Unfortunately, this valorization of blood purity could not prevent the demise of this class, as noted with Queen Chindok's childless death, which ultimately led to a need for a more sustainable succession plan, diluting the pursuit of purity.
It's difficult to name specific 'pure' royal bloodlines in the modern context due to centuries of intermarriage and the broadening definitions of nobility and royalty. However, some modern monarchies do trace their lineage back many generations, including the British Royal Family, the Japanese Imperial Family, and the Saudi Royal Family. Even in these cases, it is critical to understand that 'purity' is a concept that's largely symbolic and doesn't necessarily denote a biological or genealogical reality.