 Complete the following phrase:  The Monaldeschi della Cervara had invested themselves with Bolsena, where they built the fortifications that are still a prominent feature. Temporary victories of one group over another resulted in the demolition of houses, towers, palazzi, to the detriment of city life. A communal decree of 24 September 1347, in an attempt to put an end to such destruction, granted to the Monaldeschi the territory of Orvieto as far as Montalto di Castro, Orbetello, and the Isola del Giglio, but strife continued. In June 1351 the Monaldeschi della Cervara captured an unfortunate follower of the della Vipera and killed him so brutally in the cellars of the castello of Torre Alfina that the morsels of his body were fed to falcons. Reciprocal violence continued through the century. In 1406 the acquesiani took Monte Rufeno and San Pietro Aquaeortus, burned Marzapalo and damaged Trevio. In 1442 Alvisi Monaldeschi della Cervara, in order to regain his Torre Alfina from the condottiere Ciarpellone, under the direction of Francesco Sforza was forced to pay a thousand gold ducats. In 1527, at the time of the 