Pharnaces (son of Arsames)
Pharnaces Ι (Elamite: "Parnaka"; –497 BCE) was a son of Arsames.
He was a younger brother of Hystaspes, and therefore an uncle of Achaemenid Emperor Darius I, son of Hystaspes.
He was the founder of the Pharnacid dynasty that ruled over Hellespontine Phrygia.
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Arsames
Arsames (Aršāma,
modern Persian:،آرسام، آرشام Arshām, Greek: ; – ca.
520 BC) was the son of Ariaramnes and perhaps briefly the king of Persia during the Achaemenid dynasty, but gave up the throne and declared loyalty to Cyrus II of Persia.
After this, Arsames most likely retired to his family estate in the Persian heartland of Parsa, and lived out the rest of his long years there peacefully, though he may nominally have exercised the duties of a "lesser king" under the authority of the "Great King".
In an inscription allegedly found in Hamadan he is called "king of Persia", but some scholars believe it is a fraud, either modern or ancient.
Another attestation of his reign is the Behistun Inscription, where his grandson Darius I lists him among his royal forebears and counts him among the eight kings who preceded him.
Arsames was father of Hystaspes, satrap of Parthia, of Pharnaces, satrap of Phrygia and of Megabates, general.
Arsames would live to see his grandson, Darius I, become the Great King of the Persian Empire, though he would die during his reign.
In any case, he must have been one of the longest-surviving royals anywhere in the world at that time, probably living well into his nineties.
The name translates to "having a hero's strength".

Question: Who is the paternal grandfather of Pharnaces (Son Of Arsames)?
Answer: Ariaramnes