Orthodox Saint Paraskevia/Piatnitza (Pietka), whose name can be translated as “Friday” - like many other Christian saints in different parts of the world, is a syncretic figure. Along with other saints whose names are derived from weekdays (Sunday, Wednesday), and with Mary the Mother of God, etc. Paraskevia replaced Mokosh (Mokoš), who originally was probably pan-Slavic deity venerated among the southern and eastern Slavs. Possibly, it is her image that ornaments traditional towels from northern Russia. Particularly in some 19th Century embroideries associated with her image, she is portrayed holding most likely a water (perhaps, symbolic of rain) dish or its emblem. That alleged water dish of Paraskevia/Piatnitza was used to reconstruct the vessel of Mokosh in the new image reconstruction of the latter. The proven pluvial (moistness) aspect of the reconstructed image of Mokosh is the most important feature of this only female deity in the Vladimir pantheon. With this fact a new area for research is opening, which earlier was regarded as a possibility only. Following the new developments associated with the theory of Great Mother Goddess, the author of this article presents her own new findings that might be useful for the study of the Slavic pantheon, and the goddess Mokosh, in particular.