There are two Niobes in Greek Myth: one was the daughter of Tantalus, and a prideful mother whose children were slain by Apollo and Artemis. The other, less well-known, was the daughter of Phorenus, and the mother, by Zeus of Argus – for whom the city of Argos was named.
It should be noted also, that thus Argus was not any of the other figures in Greek Myth named either Argos or Argus – he was not the shipwright who built the Argo, nor the son of Jason and Medea named for that shipwright. Neither was he a legendarily faithful dog whose master was Odysseus, nor the hundred-eyed giant known as Argus Panoptes. He was just this guy, who happened to be the third king of Argos, and the first child Zeus had by a mortal woman. He would have lots of half-siblings, mostly posthumously.
By William Henry Goodyear, A History of Art: For Classes, Art-Students, and Tourists in Europe, A. S. Barnes & Company, New York, 1889. Page 158. Scanned by Dave Pape., Public Domain, Link
As mentioned in:
When You Sleep — Cake
Europa was the daughter of the Phoenician King and Queen, Aegnor and Telephassa. But one day, she was kidnapped by Zeus, who had taken the form of a white bull, and carried off to Crete. Here, Zeus seduced her (accounts differ as to whether he was still in the form of a bull at the time). Europa became the first Queen of Crete, and bore three sons: Minos (her heir), Sarpedon and Rhadamanthis.
So myth tells us. The truth of the matter may never be known, but from what we know of Minoan culture (named for Europa’s son), the bull was an important part of it, featuring in their religious and cultural ceremonies. The myth seems than an attempt to rationalise curious aspects of Cretan culture by mainland Greeks.
Europa’s three sons, in the myth, all became kings, Minos in Crete, Sarpedon in Lycia and Rhadamanthus in Boetia. Europa herself gave her name to the entire continent of Europe. Myth is with us, always.
One can’t help thinking that Leda knew more than she was telling. Legendarily one of the most beautiful women in ancient Greece, this queen of Sparta dallied with a swan (who, it turned out, was actually Zeus in disguise), and gave birth to perhaps the only woman to be more beautiful than her: Helen (later of Troy).
In fact, she gave birth to four children, two sets of twins. Half of them were mortal, the children of Tyndareus (her human husband), and half were half-divine, the children of Zeus. Which children are descended from which father is inconsistent across the various tellings of the myth, although a majority of versions record that Helen was half-divine (accounting for her legendary beauty).