They both share many similarites
Fenius Farsaid (sometimes Phenius) is a legendary sage and King of Scythia who appears in the Lebor Gabála Érenn (The Book of Invasions) of Irish mythology. He is said to be a descendant of the biblical Magog or Gomer and is credited as being one of the 72 chieftains who built the Tower of Babel, distributing languages after the biblical flood.
He is described as travelling from Scythia to Asia Minor in order to undertake this task. He has two sons, Nenual and Nel.. the former becomes King of Scythia after the death of Fenius, and the latter travels to Egypt, marrying Skotia. After some time, Nel's descendants are forced to leave, where they embark on an epic sea voyage, which eventually takes them to Spain, where they are described as erecting a tower in A Coruna, Galicia, which is known today as the Tower of Hercules.
Phineus, who appears in Greek mythology, is described as a Prophet of Apollo and King of Thrace, who marries the daughter of a Scythian King.
He is said to have been a relative of Cadmus, who is sometimes credited with bringing the Phoenician letters to the Greeks in the post flood era, as well as Belus.
Upon taking a second wife, who accuses his sons from a previous marriage, of wrong doing, he punishes his sons, locking them in a tomb. In some sources, these sons are rescued by the Argonauts and Hercules, where they would join the crew on their epic voyage. In one source, these sons are known as Polumedes and Klutius.
The most interesting piece of information which seemingly ties the two together, are inscriptions found in Spain's Celtic regions, which bear the name Clutious.
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