due to acquiescence and acceptance of Qipachaq authority, he did maintain an envoy to the Rus' to keep open dialogue with the Grand Prince. In concession to the khan for this near autonomy, a monetary payment based on population, military service and of course compliance to Qipachaq whim was demanded. In effect the Rus' was commanded as a tribute state to the Mongol Empire. Taking advantage of a peaceful situation with the Mongols, the Grand Prince was able to look again to his princedom and began extending his power further from Moscow. Grand Princes of Moscow ruled the Rus' for much of the rest of the century in near peace. As the Grand Princes extended their power, land ownership was assuming a more dominant role in deciding one's true worth in the social strata. Throughout the 14th and 15th centuries there were no restrictions on land ownership, as men of every class were able to hold a piece of dirt and call the other their equal. Since primary production was still the chief means of working the land, the serf class, as was seen in England, did not develop quickly. Instead the land was worked by the owner and his family, slaves, and those he paid for labor. Internal consolidation of power accompanied outward expansion of the Rus' state. Even though the occurrences of private land ownership were increasing, the Grand Prince and his subservient princes considered all the lands of their realms their personal property. Traditionally the Grand Prince was forced to recognize private ownership of land, because the prince was not able to wield enough power to push his belief in supreme ownership. Later, when the Grand Prince was able to consolidate power, the idea of princely land ownership would not be forgotten and would have consequences on the future. End of Mongol domination It was under Grand Prince Dmitri Donskoy (1359–1389) that the Grand Prince of Moscow became strong enough to fight the Mongols and win. In 1378, self-assured in his power, he stopped paying tribute. Pro-Byzantine and pro-Mongol factions began to develop among the people. Some saw the Byzantine Church and the Byzantine Emperor as the direction the Rus' should take; one not allowing for Tatar administrative and military dominance. The others saw the Mongols as a supreme way to organize and stay away from non-secular governmental influences. Helping the Rus' cause, in the time of