The article examines the peculiarities of opening proceedings in a lawsuit based on the analysis of the legislation of the Muscovite Kingdom and the Russian Empire, starting from the 2nd century. 18th and 1st centuries XIX century In fact, we are talking about the pre-reform period of procedural legislation, which existed before the introduction of the Statute on Civil Procedure in 1864.
 The author examines the peculiarity of establishing the right to sue and notes that the legislation of that time revealed it from a feudal standpoint, as it gave some strata of the population the opportunity to exercise it freely, while others did not. Thus, serfs (private peasants) in one case did not have the right to sue (in particular, they could not file a lawsuit against their master), in another - they did, but could not exercise it themselves (serfs' disputes with other estates were resolved on their behalf by their landlords), and in the third - had full right to it (disputes among themselves).
 The types of civil proceedings in disputed cases, which at that time were divided into patrimonial and civil proceedings, are studied. In the first case, the court considered a lawsuit, and in the second - a lawsuit. However, both the lawsuit and the lawsuit were filed with the court in the form of a request ("proshenie"). The form, types and details of this request are analyzed. The claimant's demands are written in paragraphs, in which they are argued by facts, and the latter are supported by evidence. The existence of both general and special norms that regulate this issue is noted (special norms determine it for certain categories of patrimonial or legal cases).
 An analysis of the procedure for submitting requests to the court is carried out, where attention is drawn to the need to comply with the rules of jurisdiction, to submit copies of requests to the number of defendants in the case and evidence that confirms the validity of the plaintiff's claims. The plaintiff also had to pay the customs duty, and in some categories of civil cases, advanced legal costs related to the publication of newspaper ads. It is indicated that the opening of proceedings in a civil case ended with a court resolution or the return of a request with an indication of the reasons for this. The author concludes that it is at this time that the stage of opening proceedings in the case begins to take shape as an independent stage of the civil process.