princes over the next two centuries, but the princely office was never abolished and powerful princes, such as Alexander Nevsky, could assert their will in the city regardless of what Novgorodians said. The city state controlled most of Europe's northeast, from lands east of today's Estonia to the Ural Mountains, making it one of the largest states in medieval Europe, although much of the territory north and east of Lakes Ladoga and Onega was sparsely populated and never organized politically. One of the most important local figures in Novgorod was the , or mayor, an official elected by the public assembly (called the ) from among the city's boyars, or aristocracy. The , or "thousandman", originally the head of the town militia but later a commercial and judicial official, was also elected by the . Another important local official was the Archbishop of Novgorod who shared power with the boyars. Archbishops were elected by the or by the drawing of lots, and after their election, were sent to the metropolitan for consecration. While a basic outline of the various officials and the can be drawn up, the city-state's exact political constitution remains unknown. The boyars and the archbishop ruled the city together, although where one official's power ended and another's began is uncertain. The prince, although his power was reduced from around the middle of the 12th century, was represented by his , or lieutenant, and still played important roles as a military commander, legislator and jurist. The exact composition of the , too, is uncertain, with some historians, such as Vasily Klyuchevsky, claiming it was democratic in nature, while later scholars, such as Marxists Valentin Ianin and Aleksandr Khoroshev, see it as a "sham democracy" controlled by the ruling elite. In the 13th century, Novgorod, while not a member of the Hanseatic League, was the easternmost kontor, or entrepôt, of the league, being the source of enormous quantities of luxury (sable, ermine, fox, marmot) and non-luxury furs (squirrel pelts). Throughout the Middle Ages, the city thrived culturally. A large number of birch bark letters have been unearthed in excavations, perhaps suggesting widespread literacy. It was in Novgorod that the Novgorod Codex, the oldest Slavic book written north of Bulgaria, and the oldest inscription in a Finnic language (Birch bark letter no. 292) were unearthed. Some of the most ancient Russian chronicles (Novgorod First Chronicle) were written in the scriptorium