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 main seat of the noble Sieniawski family's assets: a private conference between Crown Hetman Adam Mikolaj Sieniawski and the Saxon envoy Spiegel happened in 1706 at this location.