The study concerns: (1) the relationship of the weekly cycle with the fixed feasts of the Incorporeal Host, John the Bapstist, Ss Peter and Paul and St Nicholas of Myra; (2) the calendar layout including “previous” and “past” Saturdays and Sundays; (3) the dates of celebration of the collects of the saints and of some icons in the Menaion and the Triodion periods; (4) the relationship of the Triodion and Pentecostarion with fixed feasts (Ss Theodore Tyron, Gregory Palamas, Mary of Egypt); (5) the Saturdays of Remembrance. The paper presents some manuscripts in Polish collections that exhibit differences in the combination of the Lenten and Paschal cycles with fixed feasts. A detailed investigation of the extant manuscripts of this type (notably the variation of prescriptions from the last part of the Typikon and other liturgical marginal notes) should yield significant data on the history of the divine service in the Orthodox churches of the Polish–Lithuanian Commonwealth.