The Battle of Zawichost (1205) was a battle fought between Roman the Great of Galicia-Volhynia and Leszek I the White of Lesser Poland, along with his brother, Konrad I of Masovia. After declaring war and invading Lesser Poland, Roman and his forces (druzhina) were ambushed by the Poles in the vicinity of Zawichost by the Vistula (Visla) River. In the tumult that followed, Roman was killed and the Polish victory would lead to Poland's growing power and the weakening of Rus'.