Leszek I the White
Lubaczow was first mentioned in 1214, when, following the Spis Treaty between Duke Leszek I the White and Andrew II of Hungary, the gord was placed under authority of Voivode of Sandomierz, Pakoslaw Lasocic. Until 1376, Lubaczow was spelled Lubacew or Ljubacew. Upon receiving town charter (1376), the spelling of the name was changed into Lubaczow. Until 1462, Lubaczow was governed by the Dukes of Mazovia, a Polish fief. In that year, it was directly annexed into the Kingdom of Poland, as part of the newly created Belz Voivodeship, in which it remained until 1772. During the Polish–Ottoman War (1672–76), the Battle of Niemirow took place near Lubaczow (October 7–8, 1672).