How did the wool and armaments guilds gain influence in medieval Milan?

In medieval Milan, the wool and armaments guilds gained significant influence during the early 12th century as they emerged as powerful new industrial classes.1

Their rise to prominence was facilitated by the specific political structure of the time. The archbishop of Milan, who held temporal power, maintained a feudal relationship with his allies. To reinforce his own political party against rivals, the archbishop was compelled to grant enormous concessions to these burgeoning social and political forces among the citizenry. These concessions effectively diminished the financial privileges of the church and allowed the guilds to consolidate their power within the city's evolving commune structure.1

As these industrial and mercantile interests grew, they became central to the city's economic development, eventually leading to the formation of further powerful coalitions of economic interests that shaped Milanese history throughout the Middle Ages.1