- King Pedro of Castile's head chamberlain (camareiro-mor). [Pedro, ch. 21: 56-57]
- Succeeded Juan Fernández de Henestrosa as royal head chamberlain when he died.
- Faithful to the cause of King Pedro, who rewarded him with significant appointments such as Master of Alcántara and then of Calatrava. [Pedro, ch. 37: 37]
- Took the Red Emir of Granada and his retinue prisoner following Pedro of Castile's orders. [Pedro, ch. 33: 61-63]
- Accompanied Pedro of Castile and his younger daughters to Portugal, as they fled in the wake of Enrique of Trastámara's march on Castile and in face of the growing hatred of the people against him and support for the invader. [Pedro, ch. 37: 36-39]
- Arrested and accused of treason by Pedro of Castile for refusing to execute Gonzalo Fernández de Córdoba, Don Alfonso Fernández, the Lord of Montemayor, and Diego Fernández, Chief-Justice.
Martim Lopez
Martim Lopez de Cordova