bona then pursued an italian marriage. isabella of naples, isabella's grandmother, sent envoys to poland to propose marriage to francesco ii sforza, newly installed duke of milan. however, sigismund refused as the duchy was contested and francesco's hold was tenuous. bona then proposed federico ii gonzaga, duke of mantua, but he chose margaret paleologa as she brought march of montferrat as her inheritance. sigismund wanted a habsburg marriage. in 1530, he proposed maximilian, eldest son of archduke ferdinand of austria, but they refused as isabella was eight years older than the groom. when habsburgs wanted to stop the proposed marriage between isabella and john zápolya, they proposed ludovico, eldest son of charles iii, duke of savoy, but he died in 1536.