Bia
The personification of mighty force, is described as the daughter of the Titan Pallas and Styx, and as a sister of Zelos, Cratos, and Nice. ( The Theogony of Hesiod 385; Aeschylus, Prometheus Bound.)
From Smith's Dictionary of Greek and Roman Biography and Mythology(ll. 383-403) And Styx the daughter of Oceanus was joined to Pallas and bare Zelus (Emulation) and trim-ankled Nike (Victory) in the house. Also she brought forth Cratos (Strength) and Bia (Force), wonderful children. These have no house apart from Zeus, nor any dwelling nor path except that wherein God leads them, but they dwell always with Zeus the loud-thunderer. For so did Styx the deathless daughter of Oceanus plan on that day when the Olympian Lightener called all the deathless gods to great Olympus, and said that whosoever of the gods would fight with him against the Titans, he would not cast him out from his rights, but each should have the office which he had before amongst the deathless gods. And he declared that he who was without office and rights as is just. So deathless Styx came first to Olympus with her children through the wit of her dear father. And Zeus honoured her, and gave her very great gifts, for her he appointed to be the great oath of the gods, and her children to live with him always. And as he promised, so he performed fully unto them all.
From Aeschylus, Prometheus Bound
O Strength and Force, for you the best of Zeus
Stands all achieved, and nothing bars your will:
But I--I dare not bind to storm-vext cleft
One of our race, immortal as are we.
Yet, none the less, necessity constrains,
For Zeus, defied, is heavy in revenge!
From Plutarch, Life of Themistocles
XXI. Moreover, he made himself odious to the allies by sailing about the islands and wringing money from them. A case in point is the conversation which Herodotus tells us he held with the people of Andros, when trying to get money from them. He said that he was come, bringing with him two gods, Persuasion and Necessity; but they replied that they also possessed two equally powerful ones, Poverty and Helplessness, by whom they were prevented from supplying him with money. The poet, Timokreon of Rhodes, in one of his songs, writes bitterly of Themistokles, saying that he was prevailed upon by the bribes which he received from exiles to restore them to their native country, but abandoned himself, who was his guest and friend.
