During the absence of Thessaly's new ruler, Simeon Uroš Palaiologos, in the Despotate of Epirus in 1359–1360, Hlapen invaded Thessaly, attempting to win it for his stepson.
Durante a ausencia do novo gobernante de Tesalia, Simeón Uroš, no Despotado de Epiro en 1359-1360, Hlapen invadiu Tesalia, tratando de gañalo para o seu fillastro.