Tomyris was, according to Herodotus, a queen of the Massagetae.

According to Jordanes (after Cassiodorus) in De origine actibusque Getarum (The origin and deeds of the Goths), Tomyris was the queen of the Getae:

"Then Cyrus (Cyrus the Great), king of the Persians, after a long interval of almost exactly six hundred and thirty years (circa 5th century BC, as Pompeius Trogus relates), waged a war, fatal to himself against Tomyris, Queen of the Getae.

Elated by his victories in Asia, he strove to conquer the Getae, whose queen, as I have said, was Tomyris.

Though she could have stopped the approach of Cyrus at the river Araxes, yet she permitted him to cross, preferring to overcome him in battle rather than to thwart him by advantage of position. And so she did.

As Cyrus approached, fortune at first so favored the Parthians that they slew both the son of Tomyris and most of the army.

But when the battle was renewed, the Getae and their queen defeated, conquered and overwhelmed the Parthians and took rich plunder from them. There for the first time the race of the Goths saw silken tents.

After achieving this victory and winning so much booty from her enemies, Queen Tomyris crossed over into that part of Moesia which is now called Lesser Scythia (currently Dobrudja) --a name borrowed from Great Scythia-- and built on the Moesian shore of the Black Sea the city of Tomi, named after herself." Tomi was named Tomis by the Romans and is today the city of Constanta in Romania.

Herodotus Book 1: Queen Tomyris of the Massagetai

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