Władysław Łokietek, King of Poland, had two other sons besides future Casimir the Great, but these sons-Stefan and Władysław, bot died young. Say, that Władysław Jr (few years older than Kazimierz) lives longer, long enough to marry Anna Aldona, but not long enough to outlive father. Władysław Jr dies in 1328, leaving son (Władysław, born 1326) and daughter (Elżbieta, born 1328). What happens after his death? Władysław Łokietek (and his subjects) would rather preffer his adult younger son over grandson, who is still child. Times are too unstable for child king. But that is one thing-what would happen with widowed Anna Aldona? Possibly there would be rumours, that 'pagan witch' is responsible for death of heir. As long as Casimir has no sons of his own (say he has not, like IOTL) young Władysław should be safe. But Poland's relations with Hungary would be more complicated now-there is one more person between Angevins and Polish throne.
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