Ligia is the latin version of Lygia. For more see "Quo Vadis?"
Here the relevant part of Quo Vadis: "With whom, then?"
"If I knew myself with whom? But I do not know to a certainty her name even, -- Lygia or Calhina? They call her Lygia in the house, for she comes of the Lygian nation; but she has her own barbarian name, Callina. It is a wonderful house, -- that of those Plautiuses. There are many people in it; but it is quiet there as in the groves of Subiacum. For a number of days I did not know that a divinity dwelt in the house. Once about daybreak I saw her bathing in the garden fountain; and I swear to thee by that foam from which Aphrodite rose, that the rays of the dawn passed right through her body. I thought that when the sun rose she would vanish before me in the light, as the twilight of morning does. Since then, I have seen her twice; and since then, too, I know not what rest is, I know not what other desires are, I have no wish to know what the city can give me. I want neither women, nor gold, nor Corinthian bronze, nor amber, nor pearls, nor wine, nor feasts; I want only Lygia. I am yearning for her, in sincerity I tell thee, Petronius, as that Dream who is imaged on the Mosaic of thy tepidarium yearned for Paisythea, -- whole days and night do I yearn."
"If she is a slave, then purchase her."
"She is not a slave."
"What is she? A freed woman of Plautius?"
"Never having been a slave, she could not be a freed woman."
"Who is she?"
"I know not, -- a king's daughter, or something of that sort."
"Thou dost rouse my curiosity, Vinicius."
"But if thou wish to listen, I will satisfy thy curiosity straightway. Her story is not a long one. Thou art acquainted, perhaps personally, with Vannius, king of the Suevi, who, expelled from his country, spent a long time here in Rome, and became even famous for his skilful play with dice, and his good driving of chariots. Drusus put him on the throne again. Vannius, who was really a strong man, ruled well at first, and warred with success; afterward, however, he began to skin not only his neighbors, but his own Suevi, too much. Thereupon Vanglo and Sido, two sister's sons of his, and the sons of Vibilius, king of the Hermunduri, determined to force him to Rome again -- to try his luck there at dice."
"I remember; that is of recent Glaudian times."
"Yes! War broke out. Vannius summoned to his aid the Yazygi; his dear nephews called in the Lygians, who, hearing of the riches of Vannius, and enticed by the hope of booty, came in such numbers that Caesar himself, Claudius, began to fear for the safety of the boundary. Claudius did not wish to interfere in a war among barbarians, but he wrote to Atelius Hister, who commanded the legions of the Danube, to turn a watchful eye on the course of the war, and not permit them to disturb our peace. Hister required, thcn, of the Lygians a promise not to cross the boundary; to this they not only agreed, but gave hostages, among whom were the wife and daughter of their leader. It is known to thee that barbarians take their wives and children to war with them. My Lygia is the daughter of that leader."
"Whence dost thou know all this?"
"Aulus Plautius told it himself. The Lygians did not cross the boundary, indeed; but barbarians come and go like a tempest. So did the Lygians vanish with their wild-ox horns on their heads. They killed Vannius's Suevi and Yazygi; but their own king fell. They disappeared with their booty then, and the hostages remained in Hister's hands. The mother died soon after, and Hister, not knowing what to do with the daughter, sent her to Pornponius, the governor of all Germany. He, at the close of the war with the Catti, returned to Rome, where Claudius, as is known to thee, permitted him to have a triumph. The maiden on that occasion walked after the car of the conqueror; but, at the end of the solemnity, -- since hostages cannot be considered captives, and since Pomponius did not know what to do with her definitely -- he gave her to his sister Pomponia Grsrcina, the wife of Plautius. In that house where all -- beginning with the masters and ending with the poultry in the hen-house -- are virtuous, that maiden grew up as virtuous, alas! as Grxcina herself, and so beautiful that even Poppae, if near her, would seem like an autumn fig near an apple of the Hesperides."
"And I repeat to thee that from the moment when I saw how the sun-rays at that fountain passed through her body, I fell in love to distraction."
"She is as transparent as a lamprey eel, then, or a youthful sardine?"
"Jest not, Petronius; but if the freedom with which I speak of my desire misleads thee, know this, -- that bright garments frequently cover deep wounds. I must tell thee, too, that, while returning from Asia, I slept one night in the temple of Mopsus to have a prophetic dream. Well, Mopsus appeared in a dream to me, and declared that, through love, a great change in my life would take place."
"Pliny declares, as I hear, that he does not believe in the gods, but he believes in dreams; and perhaps he is right. My jests do not prevent me from thinking at times that in truth there is only one deity, eternal, creative, all. powerful, Venus Genetrix. She brings souls together; she unites bodies and things. Eros called the world out of chaos. Whether he did well is another question; but, since he did so, we should recognize his might, though we are free not to bless it."
"Alas! Petronius, it is easier to find philosophy in the world than wise counsel."
"Tell me, what is thy wish specially?"
"I wish to have Lygia. I wish that these arms of mine, which now embrace only air, might embrace Lygia and press her to my bosom. I wish to breathe with her breath. Were she a slave, I would give Aulus for her one hundred maidens with feet whitened with lime as a sign that they were exhibited on sale for the first time. I wish to have her in my house till my head is as white as the top of Soracte in winter."
"She is not a slave, but she belongs to the 'family' of Plautius; and since she is a deserted maiden, she may be considered an 'alumna.' Plautius might yield her to thee if he wished."
"Then it seems that thou knowest not Pomponia Graecina. Both have become as much attached to her as if she were their own daughter."