in march 1519, when isabella was just a two-month-old baby, french envoys proposed to marry isabella with a future son of francis i of france in exchange for sigismund's support in the upcoming elections for the holy roman emperor. sigismund supported charles v, but bona continued to pursue a french marriage for isabella. she hoped that king of france would install his son and isabella in the duchy of milan which bona claimed as her inheritance. in 1524, hieronymus łaski negotiated an anti-turkish alliance with the french; among the provisions was marriage of isabella and henry, second son of francis i. but this alliance failed after francis was taken prisoner in the battle of pavia.