 On 22 April 1459, Pope Pius II issued the bull "Triumphans Pastor", in which he raised the diocese of Siena to metropolitan status, and assigned to it as suffragans the dioceses of Soano, Chiusi, Massa Marittima (Populonia), and Grosseto.Massa was taken from the metropolitanate of Pisa.From 30 May 1135 to 6 June 1135, Innocent II held a council in Pisa, having been driven from Rome a second time by the supporters of Pope Anacletus II.