[3] John II of Castile appointed the noble Don Diego López de Medrano, lord of San Gregorio, as his mayordomo mayor and royal guard.His favourite, Álvaro de Luna, heavily influenced him until his second wife, Isabella of Portugal, obtained control of his feeble will.Among the most notable of the provisions were outlining that Jews must wear distinctive clothes and banned them from holding administrative positions.However, once John took control of the throne for himself in 1418, he (though likely influenced politically by de Luna) reversed such ordinances, favoring instead a more tolerant attitude toward the already battered Jewish population of Castile following the mass wave of conversions between 1391 and 1415.He was "[T]all and handsome, fair-skinned and slightly ruddy... his hair was the color of a very mature hazelnut, the nose a little snub, the eyes between green and blue... he had very graceful legs and feet and hands.