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As a god of archery, Apollo was known as Aphetor (/əˈfiːtər/ ə-FEE-tər; Ἀφήτωρ, Aphētōr, from ἀφίημι, "to let loose") or Aphetorus (/əˈfɛtərəs/ ə-FET-ər-əs; Ἀφητόρος, Aphētoros, of the same origin), Argyrotoxus (/ˌɑːrdʒᵻrəˈtɒksəs/ AR-ji-rə-TOK-səs; Ἀργυρότοξος, Argyrotoxos, literally "with silver bow"), Hecaërgus (/ˌhɛkiˈɜːrɡəs/ HEK-ee-UR-gəs; Ἑκάεργος, Hekaergos, literally "far-shooting"), and Hecebolus (/hᵻˈsɛbələs/ hi-SEB-ə-ləs; Ἑκηβόλος, Hekēbolos, literally "far-shooting"). The Romans referred to Apollo as Articenens (/ɑːrˈtɪsᵻnənz/ ar-TISS-i-nənz; "bow-carrying"). Apollo was called Ismenius (/ɪzˈmiːniəs/ iz-MEE-nee-əs; Ἰσμηνιός, Ismēnios, literally "of Ismenus") after Ismenus, the son of Amphion and Niobe, whom he struck with an arrow.

Who struck his parents with an arrow?
Ismenius