Question: What was the library dedicated to that Istros the Callimachean was active in?
Sentence (from "Istros the Callimachean"): Istros the Callimachean (in Greek Ἴστρος ὁ Καλλιμάχειος) was a Greek writer pupil of Callimachus and active in the Library of Alexandria.
Relevant evidence: Yes