In the early 18th century, Oleszyce became main center of properties of the noble Sieniawski family: here, in 1706, a secret meeting between Crown Hetman Adam Mikolaj Sieniawski and Saxon envoy named Spiegel took place.
In the early 18th century, Oleszyce became the key location for the Sieniawski family's wealth. A secret meeting between Crown Hetman Adam Mikolaj Sieniawski and the Saxon envoy Spiegel occurred in 1706 at this site.