Two of the sisters of Yaroslaf were found in Kief.

One of them had previously refused the hand of the king of Poland.

The barbarian in revenge seized her as his concubine.

Sviatopolk, jealous of the authority which his father-in-law claimed, and which he could enforce by means of the Polish army, administered poison in the food of the troops.

A terrible and unknown disease broke out in the camp, and thousands perished.