Szepes County
William exchanged his aforementioned inherited six villages in Szepes County for the castle of Szalánc (Slanec, Slovakia) in Abaúj County with the Szalánci family of the once prestigious Aba clan in 1330. After violent and coercive attempts, William also bought the estates of the Somosi family of the same kindred in Sáros County in 1332 – he acquired the villages Miklósvágása (Miklušovce), Szedlice (Sedlice), Szopotnyica and Szopotnyicafő in the process. When Dominic Nádasdi from the Aba clan died without male heirs, William petitioned to the royal court for his lordship, which consisted of twelve possessions to the east of Kassa (Košice) in Abaúj and Sáros counties. Charles fulfilled his request in 1335, thus William became the owner of Nádasd (Trstené pri Hornáde), Zsadány (Ždaňa), Szkáros (Skároš), Alsócsáj (Nižný Čaj), Felsőcsáj (Vyšný Čaj; as well as another estate laid between the two), Ósva (Olšovany), Bogdány (Bohdanovce), Lengyelfalva (Košická Polianka), Felnádasd (Trsťany), a portion in Széplak (Krásna) and Luzsány (today part of Kojatice), present-day all locate in Slovakia. Following a successful litigation of Dominic's widow (Clara, daughter of the late Dózsa Debreceni) and sisters, William was forced to return some estates – Alsócsáj, Felsőcsáj and Ósva – to them in 1337. William also acquired the village of Újlak (Novosad) in Zemplén County at some time, possibly after the death of his father. William unsuccessfully tried to seize the Balog lordship in Gömör County in 1336, when captured and imprisoned its lord Doncs Balog, who himself was the nephew of Felician Záh, who attempted to assassinate the royal family six years earlier. William requested Charles to grant his lordship, which consisted of eight possessions, but he was confronted with this step with the Szécsi family of the Balog clan, who were also strong confidants of the Hungarian monarch. Finally, William was forced to retreat.