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The first stage of law development in Kievan Rus finished with transition from verbal traditional law to written law.
It prescribed what food could or could not be eaten on which days through the year, whom and how one could or could not marry, what to wear or not wear, when to have or not to have sexual intercourse and in what manner [1, 128].
Kievan princes took account of its principles in treaty-making with Byzantium.
Unfortunately, the text of Zakon Ruskiy didn't remain till nowadays.
But the rules of traditional law didn't lose, for example they continue to remain the main source of law for communal court.
Therefore, the rules of traditional law could exist both in oral and written forms.