Walter did not abandon his plans for regaining his inheritance in Greece, and retained papal support, which materialized in repeated excommunications of the Catalans. With the Venetians firmly opposed to rendering any help, however, Walter's plans could not be fulfilled. After further ventures and adventures in Italy and France, Walter was killed at the Battle of Poitiers in 1356. During this time, the Argolid suffered a raid by the Aydinid Turks under Umur Bey in 1332, which coincided with a prolonged famine that required food to be imported from Italy. At the same time, Argos and Nauplia also came within reach of the expanding Byzantine province in the Morea, which by had expanded from the southeast to include most of Arcadia and Cynuria. The increased threat to the lordship prompted Walter II to construct two new castles, which first appear in his will of 1347: at Kiveri ("Chamires" in French) across the Argolic Gulf from Nauplia and Thermisi ("Trémis") further east along the coast, across Hydra Island. Despite the depredations from raids, the Brienne fief was relatively prosperous: the area was fertile and supported agriculture, pastures for livestock, and vineyards, while the Argolic Gulf provided fisheries and salt flats near Thermisi. According to documents from later in the 14th century, carobs, raisins, resin and acorn dyes, as well as cotton and linen cloth, were exported.