Three of my grandparents are descendants of Of_Parthia-3 (AD 25 -78), as well as Ap_Calpurnius-1 (300-?). The lineage of my paternal GM, Coe-2227; paternal GF, Barbour-1017; and maternal GM, Hoover-3274 results in many noted historical subjects being triple GGFs. The two mentioned plus Charlemagne, and AEthered Wessex, 2nd King of England, for example. From the Battle of Hastings, both William-1 and Harold Wessex.
Magna Carta - Of the 25 Barons, respectively 14 GGF/10 cousins; 16/8 and 1/23.
As to US Presidents, I (Kellogg-1557) a cousin to 34; paternal GM-33; paternal GF-32; and maternal GM-30.
This is mind boggling and too much to explore in a lifetime.
If it were not for the efforts of the WikiTree "accurate single family tree" creators and subsequent members, I doubt I would have ever found my early roots. (LOL)
Another category for WikiTree Tops?