The Moscow Kremlin Wall is a defensive wall that surrounds the Moscow Kremlin, recognisable by the characteristic notches and its Kremlin towers. The original walls were likely a simple wooden fence with guard towers built in 1156. The Kremlin walls, like many cathedrals in the Kremlin, were built by Italian architects. History One of the most symbolic constructions in Russia's history, the Moscow Kremlin Wall can be traced back to the 12th century when Moscow was founded in 1147. The original outpost was surrounded by the first walls in 1156, built by Yuri Dolgoruki, prince of Suzdal, which were most likely a simple wooden fence with guard towers. Destroyed in 1238 by the Mongol-Tartar invasion, the Moscow Kremlin was rebuilt by the Russian Knyaz Ivan Kalita. In 1339-1340 he erected a bigger fortress on the site of the original outpost which was defended by massive oak walls. Thought to be an impenetrable defence from raids, it was proven to be useless against raids which burned Moscow in 1365. Nevertheless, the young knyaz Dmitry Donskoy in 1367 began a rebuilding of the fortress. All winter long from the Mukachyovo village 30 (country miles) from Moscow, limestone was hauled back on sledges, allowing the construction of the first stone walls to begin the following spring. The walls successfully withstood two sieges during the Lithuanian–Muscovite War (1368–72). Within a few years the city was adorned with beautiful white-stone walls. Whilst it was successfully invaded by the Tatars again in 1382, the massive fortification suffered no damage. Dmitry Donskoy's walls stood for over a century, and it was during this period that Muscovy rose as the dominant power in Northeastern Rus. By the end of the 15th century, however, it was clear that the old constructions had long passed their time and Czar Ivan the Great's visions. Between 1485 and 1495 a whole brigade of Italian architects took part in the erection of a new defence perimeter including Antonio Fryazin (Antonio Gilardi), Marko Fryazin (Marco Ruffo), Pyotr Fryazin (Pietro Antonio Solari) and Alexei Fryazin the Old (Aloisio da Milano). (The term Fryazin was used to refer to all people of Italian origin at this time). The new walls were erected by building on top of the older walls (some white stone can still be seen at the base in some places). The thickness and height was dramatically increased requiring many wooden houses which surrounded