Ermesinda Garcés

Ermesinda Garcés ( or ; died after 1 July 1110) was an infanta (princess) of the Kingdom of Pamplona. She is best known for assassinating her brother King Sancho IV with another brother, Ramón, as an accomplice.

Ermesinda was born around 1046.

Ermesinda was constantly in the entourage of King Sancho and witnessed his royal acts. The nobility of Pamplona became discontented with Sancho's policies, viewing him as unjust, and eventually his own family turned against him. In 1076, Ermesinda and another brother, Ramón, invited Sancho on a hunt, the king's favorite pastime. On 4 June, the hunting party stopped on a rocky outcrop at Peñalén, overlooking a precipice above the Aragón. Sancho went to enjoy the view, and was pushed off to his death.

In the aftermath of the murder, Ermesinda sought refuge at the court of Alfonso, who arranged for her to marry a Pamplonese nobleman, Fortún Sánchez de Yárnoz. She died after 1 July 1110,