Maria was occasionally politically active on behalf of her brothers, the princes of Aragon; she disregarded her husband's policy in favor of her brothers and the relationship between Maria and John was somewhat tense.
Ratu Maria kadang-kadang aktif secara politik atas nama saudara-saudaranya, para pangeran Aragon; dia mengabaikan kebijakan suaminya demi mendukung saudara-saudaranya dan hubungan antara Maria dan Juan agak tegang.