Pietro Antonio SOLARI (c.1450-1493): The Kremlin walls were built by Solari and Ruffo c. 1485. Nabatnaya Tower (left; also called the Alarm Tower) was built in 1495 during the reign of Ivan III (r. 1462-1505). Tsarskaya Tower (middle) was built in 1680 and replaced a wooden tower from the time of Ivan III.