nearby forts. The king attempted to weaken the unity among Matthew's partisans through diplomatic means. According to a royal charter issued in September 1315, Charles I stripped three of the oligarch's servients of all their possessions and gave those to Palatine Dominic Rátót, because they absolutely supported all Matthew Csák's efforts and did not ask for the king's grace. One of these sanctioned nobles was Felician Záh, who later unsuccessfully attempted to assassinate the entire royal family in 1330. In 1316, some of his former followers rebelled against Matthew, and although he occupied their castle at Jókő, some of them left his domain. In 1317, he invaded the possessions of the Diocese of Nyitra, and his troops occupied and pillaged its see. As a consequence, Bishop John excommunicated him and his followers again. The king's armies continued to invade his territories and occupied Sirok and Fülek (Fiľakovo), but Matthew could maintain his rule over his territories until his death. Domain Matthew Csák's domain had been developing gradually before the Battle of Rozgony, and it reached its greatest territorial extent around 1311. By that time, 14 counties of the kingdom, and about 50 castles were under his and his followers' rule. Around 1297, he organized his own court, similar to the king's court and he usurped royal prerogatives on his domains, similarly to other oligarchs (e.g., Amade Aba, Nicholas Kőszegi) of the beginning of the 14th century. Thus he became the de facto ruler of his domain and he made alliances independently of the king. He refused to accept appeals to the king against his decisions and he denied to put claimants in possession of lands the king had granted them on his territories. Although some of the local landowners did not want to accept Matthew's supremacy, but sooner or later, they had to leave their possessions. Following his death, his cousin Stephen Sternberg (or Stephen the Bohemian) became the lord of his domain, because his son (Matthew IV) had died and his grandsons (Matthew V and James) were still minors at the time of his death in 1321. However, Stephen Sternberg could not resist the king's invasion and Matthew Csák's former domain was overtaken by the king's armies in a few months' time. Legacy in the Slovak romantic movement Matthew Csák significantly influenced regional history of today's Slovakia in the 13th–14th centuries. Alongside other activities, he founded several new settlements