The Temple of San Sebastiano is a late-Renaissance- or Mannerist-style church in Milan. The cylindrical church is shaped like a can capped with a dome. The octagonal church was commissioned in 1576, after the end of a season of plague, dedicated to St Sebastian. The non-linear layout is atypical for post-Tridentine churches. Perhaps the site, which had housed an earlier medieval church or sanctuary dedicated to San Quilino, dictated the shape. Some evidence suggests that the architect Pellegrino Tibaldi designed the building with other round churches or the Pantheon as models. He did not spare the mannerist details such as false windows on the top story, and highly decorated spandrels.