Without issue after two unhappy marriages, Ermengarde designated as heir Pedro Manrique de Lara -the second but eldest surviving son of her half-sister Ermessinde (who had died in 1177) by her husband, Count Manrique Pérez de Lara (who was killed in battle in Garcianarro on 9 July 1164).
Ermengarde designated Pedro Manrique de Lara as heir after two unsuccessful marriages and through the lineage of her half-sister Ermessinde's son by her husband, Count Manrique Pérez de Lara.