Matthew Csák significantly influenced regional history of today's Slovakia in the 13th–14th centuries. Alongside other activities, he founded several new settlements mainly in Trencsén County and supported raising towns. The level of independence he had achieved together with his contacts with the Czech lands (especially with Moravia) positively influenced also the development of local Slovak speaking nobility. Regardless of his relatively short rule his (ex-)domain was called the Matthew's Land ("terra Matthei") already in the 14th century. This concept had been preserved until the 15th century, when individuals still used to claim their origin from the Matthew's Land ("de Terra Matthei") instead of the official administrative divisions or settlements of the Kingdom of Hungary.