You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Apollo

Context:
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.

Question:
Who struck his parents with an arrow?

Ismenius