(OOC: Not sure my stats are that historical. House Lubomirski's economic foundation were based upon massive salt mines in the province of Krakow (manufactory?) and they later opened up more mines. Their income from their salt mines they used to start loaning out money to even the richest families (banking). Those unable to pay their debts had their properties taken (Estates). Around 1650 they were the third richest family in Poland-Lithuania (and the Deluge cost the Radziwill much of their wealth in 1660), leaving only the Ostrog as their competitors for the title of the richest family, through them holding the Ostrog Ordination.
Theofilia Zasławski became the only heir to the Ostrog and thereby the Ostrog Ordination. This ordination was the largest one in the Volhynia, accounting for 11,000 square kilometres (4,200 sq mi) – about a third of the Volhynian Voivodeship – with over 1,000 settlements, including several dozen towns. As a result of her marriage to Josef Karol Lubomirski, the large landed estates of the Ostrogski Ordination were transferred to the Lubomirski family. The combined fortune of Zasławskis and Lubomirskis would become for a time the largest fortune in the Commonwealth.)