Semiramis

Assassin of Red, Aka no Assassin, 赤のアサシン
Servant of Shirou as part of the Red Faction in the Turifas Holy Grail War of Fate/Apocrypha. Assassins identity is Semiramis Wise Queen of Assyria a legendary queen who reigned over the empire of Assyria. Since her childhood she has studied a wide range of disciplines such as cosmetics hairdressing dancing clothing music astronomy and her beautiful face has captivated many men. A very enthusiastic person she indulges in luxury and decadence. Her passion has led her to start a war to possess a single man and to poison her husband the king for politics. But her abilities as a queen are indisputable as she has led many expeditions as seen on walls and the Ishtar Gate. She uses poison as her weapon. Source: TypeMoon Wiki
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