Like his ancestors, he was constantly combatting the Welsh and at one time suffering a great defeat. However, in the end he was victorious and took twelve of their principal leaders in one battle. He then enlarged his territories considerably and also ejected thieves and robbers from those parts. Being at one time present at the solemn anniversary of his father, he confirmed all his grants to the canons of Wigmore. He then added his own gift of a spacious and fruitful pasture lying adjacent to the abbey and called the 'Treasure of Mortimer'. When his steward remonstrated with him for parting with so valuable a treasure, he replied, "I have laid up my treasure in that field, where thieves cannot steal or dig, or moth corrupt." By his first wife he had a son and two daughters. His second wife, Isabel de Ferrers, was the sister and heir of Hugh de Ferrers and brought him three sons as well as many properties.
Source: Leo van de Pas