Vselov

Prince of Polotsk region in Kiev.

Treated the Byzantine Envoys with courtesy, housed them in his palace, allowed them free reign in his library and loaned them the use of sleighs and drivers to speed them through Polotsk into Novgorod.

Demonstrated the power of the Spear of Cleitus (see Weapons of Note) by temporarily turning Ivan's armor into paper when the Spear pierced it.

Not trusted by Prince Vladimir, reciprocates the feeling. Possibly planning to rebel.

High level mage with the ability to teleport, including into the Black Tower.