- (c.1366-1406) Natural son of Prince Dom João of Portugal, the son of King Pedro of Portugal and Inês de Castro.
- Married Teresa de Andeiro for love and against his father's wishes, according to Fernão Lopes. [Fernando, ch. 134]
- After a period of exile in Castile, he returned to Portugal on the same occasion as Dom Pedro de Castro. King João I welcomed him and he set up residence in Court. [João2, ch. 130]
Chronicle entries in which Pedro da Guerra appears:
Crónica de D. Fernando, ch. 134
Crónica de D. João I, part 2, ch. 130