sentences:  Giorgio has named Filippo Maria Visconti of Milan as his trustee, but Teobaldo's mother Lucrezia degli Alidosi, appointed herself as regent.Spurred by Visconti, the Forliveses rebelled and called in the Milanese condottiero Agnolo della Pergola.Florence reacted and, after some initial setbacks, it was joined by Venice in 1425 thanks to the efforts of the Count of Carmagnola.