The Celts in Poland.

Below

some links I have found - there may be more of it,,

affinities between Poles and Celts.

I can't believe that Celts were Slavs ;

Can you explain what did you mean by 'ethnically'?

The age and the original purpose of the mound remain a mystery. Excavations conducted in mid-1930s revealed that the mound consists of a solid wooden core covered with soil and turf. Some artifacts dating from between the 8th and 10th centuries were found inside, but no human remains were discovered. According to another hypothesis the mound is of Celtic origin and dates from the 2nd-1st century BCE.[2]

The pair of man-made barrows some fifty feet high (16.7 m and 14.6 m respectively) upon natural elevations 5,5 miles apart were easily seen from afar. And together with two natural Krakow hills they constitute a gigantic astronomical calendar. From the westernmost Sikornik mountain one can observe the sunrise exactly over the Wawel Hill on the spring equinox as well as on the autumnal one, and over the Mound of Krak on November 1, i.e. the Celtic New Year’s Day. While watched from the Mound of Krak, the sun rises over the Mound of Wanda on the eve of the second biggest feast of Celts, May 1.

The Krakus Mound contains, according to legend, a tomb of Krak, the ancient ruler of Cracow. In reality it was more likely to have been used as a religious site of the Celts.

There is also a theory linking the rise to mounds (Krakusa and Wanda) With the presence of Celtic in this area. The Celtic culture of mounds served an important function of a cult, just might be in this case. It was observed that azimuth connecting the two mounds is consistent with the azimuth of sunrise on 1 May. Similar compliance was found in the case of two mounds in the vicinity Przemysl, Except that they shall appoint 1 November. In the Celtic calendar, these dates were important festival associated with the division year in two halves. If this is not a coincidence could testify about the role of the mound as an astronomical observatory, or even the type of calendar.

Galicia, Galacia or Halychyna (Polish: Galicja, Ukrainian: Галичина (Halychyna), German: Galizien; Russian: Галичина (Galichina), Yiddish: גאליציע (Galitsie), Czech: Halič) is a historical region in Eastern Europe, currently divided between Poland and Ukraine,

Galicia (there is also another one in Poland), Galitia (Turkey), Gaul (France), and Gailes (the Irish Celts). All appear to have a similar root in a common language reinforcing the once dominance of the Celtic people across Europe’s boundaries.

The region has a turbulent history. In Roman times the region was populated by various tribes of Celto-Germanic admixture, including Celtic-based tribes – like the Galice or "Gaulics" and Bolihinii or "Volhynians" – the Lugians and Cotini of Celtic, Vandals and Goths of Germanic origins (the Przeworsk and Púchov cultures). Beginning with the Wandering of the nations, the great migration coincident with the fall of the Roman Empire, the area was invaded by various groups of nomadic people, starting with late-100 AD Scythians, Sarmatians (including Alans, Croats and Serbs) (4th-5th century), Huns (5th century), Avars (6th-8th century), Slavs (with Slavized Croats and Serbs, 6th-9th century),

Ancient Imperial Rome attacked southern Poland and annexed it to their colony of Pannonia.

cannabis found in these graves

Sarmatian and Skythian cultures

The evidence is strong that the ancient Celts were very much influenced by the Sarmatian and Skythian cultures, and by others similar to them.