Istrice occupies the north-westernmost edge of Siena and contains the San Vincenzo e Anastasio church, home of the city's oldest surviving fresco. Traditionally, its residents were blacksmiths. Istrice's symbol is a crowned porcupine. The contrada’s motto is “Sol per difesa io pungo” which means “I prick only for self-defense.” Its colors are white, red, blue, and black. Istrice’s allies are Caterpillar (Bruco), Snail (Chiocciola), Little Owl (Civetta), and Giraffe (Giraffa).