Most researchers in the list of children of Vladimir Svyatoslavich place Svyatoslav next to Yaroslav. The order of seniority of the sons of Vladimir Svyatoslavich remains conditional. But, if Svyatoslav was the son of Malfrida, then he could most reliably be born in 982. Based on this, N. Baumgarten and some other researchers considered Svyatoslav older than Yaroslav.

The beginning of the civil strife
Having received news of the murders of Boris and Gleb, Svyatoslav Drevlyansky left his capital and tried to flee to the Carpathian Mountains.
The death of Svyatoslav Vladimirovich
The chase caught up with the prince on the banks of the Opir near the present city of Skole. On the banks of the Stryi River, seven sons of Svyatoslav died in battle, and the village at that place is still called Semiginov (in memory of the seven dead). The legend tells of a fierce battle between the Skole River and the village of Grebenovo. The whole valley was covered with the bodies of the dead. The forces of the squad of Svyatopolk the Accursed surpassed the enemy, when the Kyiv prince saw that victory was close, he decided not to leave anyone from the family of the persecuted brother alive and gave the order:
“Chop(in rus spelled like “Skolot”) them all!”
With this episode, the legend connects the name of the city of Skole. Prince Svyatoslav died in this battle, and a few of his surviving warriors refused to go to the service of Svyatopolk and settled in the Beskydy mountains, laying the foundation for the village of Slavsky.
After the death of Svyatoslav and his troops, Svyatopolk’s warriors climbed the mountain and killed his relative (according to another version, she threw herself off the top so as not to get to the opponents for desecration). Since then, according to legend, the mountain is named after her Parashka.
In honor of Paraska, on the eastern slope of Parashka, there is a memorial stone with a sign:
“In 1015, the daughter of the Derevlyansky Prince Svyatoslav, Paraskovia, died and was buried, and this mountain was named Paraska.”
The death of Svyatoslav and the struggle for power between the sons of Vladimir Svyatoslavich deprived the Carpathian Croats of their last ally, and the valleys of Borzhava and Latoritsa were annexed by the Hungarians.
Family of Svyatoslav Vladimirovich
Chronicle data can be interpreted in such a way that Svyatoslav’s mother was a “Czech woman”. This can explain the only reliably known fact of his biography: in 1015, after the death of his father and the reign of Svyatopolk the Accursed, Svyatoslav fled from him “to the Ugorsky mountains” (Carpathians), that is, in the direction of the Czech Republic, but Svyatopolk’s servants overtook and killed him. Tatishchev calls his mother Malfrida.
The Nikon Chronicle reports that in 1002 Svyatoslav’s son Jan (that is, John) was born. There is no more information about him, just as there is no confidence in the authenticity of these tidings.
The flight of Svyatoslav through the Carpathians, as well as the name of his son Jan, suggest that his wife could be the daughter of the last Borzhava prince. Perhaps this prince tried with the help of such an alliance, hoping to defend the independence of his principality.
There is a version that Svyatoslav’s wife was a Hungarian princess. V. Shusharin and I. Shekera believe that Svyatoslav Vladimirovich was married to the daughter of the Hungarian King Stephen I, to whom he fled in 1015. There is no confirmation of this version in Hungarian sources.
Memory
The excavations of the mound, called Svyatoslav’s grave, even with a critical approach to their results, confirmed that this was the burial of a noble combatant of the 11th century. It is possible that it was Prince Svyatoslav. Now on his grave there is a monument by the famous Lviv sculptor T. Brizh.