Igor of Kiev
He thus came to the foot of the Hungarian hill, and after concealing his troops, he sent messengers to Askold and Dir, representing himself as a stranger on his way to Greece on an errand for Oleg and for Igor', the prince's son, and requesting that they should come forth to greet them as members of their race.[7] Igor twice besieged Constantinople, in 941 and 944, and although Greek fire destroyed part of his fleet, he concluded a favourable treaty with the Byzantine Emperor Constantine VII (945), the text of which the chronicle has preserved.As a result, Olga changed the system of tribute gathering (poliudie) in what may be regarded as the first legal reform recorded in Eastern Europe.Drastically revising the chronology of the Primary Chronicle, Constantin Zuckerman argues that Igor actually reigned for three years, between summer 941 and his death in early 945.Referring to the Ioachim Chronicle, Vasily Tatishchev argues that the Swedish princess Efanda, whose existence has been questioned by many historians, was Igor's mother.