How “Albanian” was Georgios Kastriotis or Skanderbeg, what does the domed tomb at the Hilandar Monastery on Mount Athos hide?

Questions about Georgios Kastriotis: The “Tower of the Albanian” on Mount Athos, the relations of Ioannis Kastriotis, Georgios’s father, with Mount Athos – The arcosolium (domed tomb) at the Hilandar Monastery and who has been buried there