On 27 April 1464, most of the town was destroyed in a fire, which only the bishop's estates and St. Luzi monastery survived. With the bishops' power waning as he came increasingly under the influence of the nearby Habsburg County of Tyrol, the citizens sent a delegation to Emperor Frederick III. The Emperor reconfirmed the historic rights of Chur and also granted them extensive new rights which freed the city from the bishop's power. In 1465 the citizens wrote a constitution which granted all governmental power to Chur's guilds. All government positions were restricted to guild members, allowing the guilds to regulate all aspects of life in Chur. Because guild membership was the only route to political power, local patricians and nobles quickly became guild members, often joining the winemakers guild.