What is "valkyria"

Valkyria \Val*kyr"i*a\, n. [Icel. valkyrja (akin to AS. w[ae]lcyrie); valr the slain + kj[=o]sa to choose. See Valhalla, and Choose.] (Scand. Myth.) One of the maidens of Odin, represented as awful and beautiful, who presided over battle and marked out those who were to be slain, and who also ministered at the feasts of heroes in Valhalla. [Written also Valkyr, and Walkyr.]

is a series of military-themed tactical role-playing games created and developed by Sega. The series began with the release of Valkyria Chronicles for the PlayStation 3 in 2008. Two sequels have been released on the PlayStation Portable, with the latest installment, Valkyria: Azure Revolution, to be released for the PlayStation 4. The original game was ported to Microsoft Windows, and a remastered version was released on the PlayStation 4. The series has also been expanded into an anime and manga media.