R1a-YP254 appear to be very popular branch of R1a in Poland despite its young age (YFull gives TMRCA of about 2100 years). Many of R1a samples with DYS385=10-14 and DYS439=10 have YP254 mutation.
I suppose that about 20% of Poles have R1a-YP254. YP254 is heavily concentrated in what is today Poland. So there is a seed of truth in Polish legend abound Lech as a forefather of Poles
Four subclades of YP254 were found so far: YP414 (many of people from this lineage have also mutation YP610), Y2905 (which has at least three sublineages: R-Y23110, R-YP415, R-YP1364), Y4135 and YP5297.
Interestingly, two subfamilies of R-YP254 were found in Finland (one from Y2905 subclade and one from Y4135 subclade).
I suppose that about 20% of Poles have R1a-YP254. YP254 is heavily concentrated in what is today Poland. So there is a seed of truth in Polish legend abound Lech as a forefather of Poles
Four subclades of YP254 were found so far: YP414 (many of people from this lineage have also mutation YP610), Y2905 (which has at least three sublineages: R-Y23110, R-YP415, R-YP1364), Y4135 and YP5297.
Interestingly, two subfamilies of R-YP254 were found in Finland (one from Y2905 subclade and one from Y4135 subclade).