The work is about Indo-Europeans in general, that means people possessing R1a haplogroup (and following mutations) of
Y-DNA, as per inheriting from father to son. Our interest is in the group of Indo-Europeans who evolved into Slavs and, in particular,
modern Poles. The article shows that the area of today’s Poland was probably the cradle of people and language that gave origin
to other Indo-European peoples (Aryans, Scythians, and Slavic) and their languages. Today’s Poles are the nation with the highest
frequency of R1a haplogroup in Europe. Genetic, and also other (linguistic and anthropological-cultural) studies indicate that the
origin of Poles is ancient, directly from the ancestors of the Lechites or Lekhs described in the chronicles. There are also grounds for
claiming that the Lekhs’ connections with people from Aryans are both genetic / biological and cultural (a logical proof). The author
provides daring hypotheses and proceeds to check them through logical deduction (inductive-deductive method), while trying the
synthetic approach to the problem and using a multidisciplinary approach. Hypotheses checks and logical justifications are backed
by research results in new research – in genetics and archaeogenetics, particularly.