The Polish king and Henry were enemies at this time, hence Sviatoslav made a treaty at once with the king, and sent Oleg, his own son, with Monomach, son of Vsevolod, to assist him. Henry’s efforts were vain, so Izyaslav’s son visited Rome to beg aid of Gregory, the seventh of that name, the strong Pope who forced Henry IV to stand thinly clad in the cold at Canossa. The Russian prince declared that his father was ready to recognize papal supremacy, if Gregory would only restore Kief to him. The Pope wrote at once to the Polish king, touching the gifts which he had taken from Izyaslav before sending him out of the country. At this juncture Henry’s ally, the Bohemian king, Vratislav, heard that two Russian princes were coming with warriors to attack him. He asked peace of Boleslav, and obtained it for one thousand grievens in silver. Boleslav then directed Oleg and Monomach to return, as peace had been concluded. They replied that they could not go back without shame, unless they won honor. Hence they advanced to get honor. During four months they “went through” Vratislav’s land—to “go through” means to ravage. Vratislav then gave them a thousand grievens in silver for peace. They made peace, and returned home with the money—and with honor. The Polish king, angered by Oleg and Monomach, and roused by Pope Gregory, promised to help Izyaslav, and began an advance on Kief. Meanwhile Sviatoslav died, and Vsevolod set out with forces to meet Boleslav, but upon reaching Volynia he made peace, yielding in favor of Izyaslav, who became Grand Prince for the third time, and Vsevolod returned to Chernigoff. There was trouble on all sides, however. In 1076, during winter, Monomach hastened to Novgorod to help Glaib against Vseslav the wizard, who was raiding and would give no rest at any time unless that which he claimed was assured him. Some months later Monomach was joined by his father, Vsevolod, and they marched against Vseslav, taking with them Polovtsi warriors, employed now for the first time in conflicts between princes. They made an attack, but could not crush Vseslav; he was too swift in his movements. They could lay waste to the country, but could not conquer the wizard, or stop him. They could only watch and then ward off the blows which he struck at one point or another.