John did not provide a great deal of money for his wife's household and did not pass on much of the revenue from her lands, to the extent that historian Nicholas Vincent has described him as being "downright mean" towards Isabella.
Xoán non deu unha gran cantidade de diñeiro polas propiedades da súa muller e non transferiu moitos dos ingresos das súas terras, o que levou ao historiador Nicholas Vincent a describilo como "realmente malo" con Isabel.