LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Mardonius

Mardonius m sg (genitive Mardoniī or Mardonī)
Classical[marˈdɔ.ni.ʊs]Ecclesiastical[marˈdɔː.ni.us]

Meaning

  1. masculinesingularA Persian general, defeated by Pausanias

Declension

declension
formsingularplural
nominativeMardonius—
genitiveMardoniī
Mardonī		—
dativeMardoniō—
accusativeMardonium—
ablativeMardoniō—
vocativeMardonī—

Mardŏnĭus, ii, m., = Μαρδόνιος,
I. a son-in-law of Darius, and general of the Persians, defeated by Pausanias at Platæa, Nep. Paus. 1, 2; Just. 2, 13, 1; Curt. 4, 1, 12.

Origins

From Old Persian 𐎶𐎼𐎯𐎢𐎴𐎡𐎹 (m-r-du-u-n-i-y /⁠Mr̥duniyaʰ⁠/) via Ancient Greek Μαρδόνιος (Mardónios).

In the Academy Smith's classical dictionaries

Biography & mythologyMardoniusMardonius (Μαρδόνιος), a Persian, son of Gobryas, who was one of the seven conspirators against Smerdis the Magian, in B. C. 521. (See Hdt. 3.70, &c.)…

Quick answers

What does Mardonius mean in Latin?
Mardonius, a proper noun, means “A Persian general, defeated by Pausanias”.
What is the genitive of Mardonius?
The genitive singular is Mardoniī. Mardonius is masculine, second declension.
How do you pronounce Mardonius?
In classical Latin, [marˈdɔ.ni.ʊs]; in ecclesiastical (church) Latin, [marˈdɔː.ni.us].