The bishop was forced to concede a greater say in the running of the city to the nobility in exchange for their help during a territorial dispute with Arezzo, and this started a process which culminated in 1167 when the commune of Siena declared its independence from episcopal control.
O bispo viuse obrigado a conceder maior intervención no goberno da cidade á nobreza, a cambio da súa axuda durante unha disputa territorial con Arezzo, e isto iniciou un proceso que culminou en 1167 cando a comuna de Siena declarou a súa independencia respecto ao control episcopal.