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The next, very significant date in the history of Russia, was 988. This was the Baptism of Russia, when Prince Vladimir, the great-grandson of Rurik, baptized Russia and adopted Orthodoxy, or Eastern Christianity. From this time the centralized Russian state began to strengthen. Why? Because of a single territory, integrated economic ties, one and the same language and, after the Baptism of Russia, the same faith and rule of the Prince.<ref>''Cuius regio, eius religio'' (''In the Prince's land, the Prince's religion'') is the cornerstone of the [[Treaty of Westphalia]].</ref> The centralized Russian state began to take shape.

The next, very significant date in the history of Russia, was 988. This was the Baptism of Russia, when Prince Vladimir, the great-grandson of Rurik, baptized Russia and adopted Orthodoxy, or Eastern Christianity. From this time the centralized Russian state began to strengthen. Why? Because of a single territory, integrated economic ties, one and the same language and, after the Baptism of Russia, the same faith and rule of the Prince.<ref>''Cuius regio, eius religio'' (''In the Prince's land, the Prince's religion'') is the cornerstone of the [[Treaty of Westphalia]].</ref> The centralized Russian state began to take shape.

Back in the Middle Ages, Prince Yaroslav the Wise introduced the order of succession to the throne, but after he passed away, it became complicated for various reasons. The throne was passed not directly from father to eldest son, but from the prince who had passed away to his brother,<ref>In the 20th and 21st centuries, a similar situation developed in the [[House of Saud]], which has been the ruling family of the [[Saudi]] state since 1925.</ref> then to his sons in different lines. All this led to the fragmentation and the end of Rus’ as a single state. There was nothing special about it, the same was happening then in Europe. But the fragmented Russian state became an easy prey to the empire created earlier by Genghis Khan. His successors, namely, Batu Khan, came to Rus’, plundered and ruined nearly all the cities. The southern part, including Kiev, by the way, and some other cities, simply lost independence, while northern cities preserved some of their sovereignty. They had to pay tribute to the Horde, but they managed to preserve some part of their sovereignty. And then a unified Russian state began to take shape with its centre in Moscow.

Back in the Middle Ages, Prince Yaroslav the Wise introduced the order of succession to the throne, but after he passed away, it became complicated for various reasons. The throne was passed not directly from father to eldest son, but from the prince who had passed away to his brother,<ref>In the 20th and 21st centuries, a similar situation developed in the [[House of Saud]], which has been the ruling family of the [[Saudi]] state since 1925. Passing the crown sideways instead of ina linear fashion under the laws of [[primogeniture]] can create numerous claimants or "rightful heirs" to the throne.</ref> then to his sons in different lines. All this led to the fragmentation and the end of Rus’ as a single state. There was nothing special about it, the same was happening then in Europe. But the fragmented Russian state became an easy prey to the empire created earlier by Genghis Khan. His successors, namely, Batu Khan, came to Rus’, plundered and ruined nearly all the cities. The southern part, including Kiev, by the way, and some other cities, simply lost independence, while northern cities preserved some of their sovereignty. They had to pay tribute to the Horde, but they managed to preserve some part of their sovereignty. And then a unified Russian state began to take shape with its centre in Moscow.

The southern part of the Russian lands, including Kiev, began to gradually gravitate towards another ”magnet“ – the centre that was emerging in Europe. This was the Grand Duchy of Lithuania. It was even called the Lithuanian-Russian Duchy, because Russians were a significant part of its population. They spoke the Old Russian language and were Orthodox. But then there was a unification, the union of the Grand Duchy of Lithuania and the Kingdom of Poland. A few years later, another union was signed, but this time already in the religious sphere. Some of the Orthodox priests became subordinate to the Pope. Thus, these lands became part of the [[Polish-Lithuanian state]].

The southern part of the Russian lands, including Kiev, began to gradually gravitate towards another ”magnet“ – the centre that was emerging in Europe. This was the Grand Duchy of Lithuania. It was even called the Lithuanian-Russian Duchy, because Russians were a significant part of its population. They spoke the Old Russian language and were Orthodox. But then there was a unification, the union of the Grand Duchy of Lithuania and the Kingdom of Poland. A few years later, another union was signed, but this time already in the religious sphere. Some of the Orthodox priests became subordinate to the Pope. Thus, these lands became part of the [[Polish-Lithuanian state]].