 In the fall of 1955 Sikorski enrolled at the Nicolaus Copernicus University in Toruń, where he chose to study under professor , who among other scholarly pursuits studied and researched the life and politics of Copernicus' maternal uncle, Bishop Lucas Watzenrode.Sikorski wrote his master’s thesis on Watzenrode, and subsequently wrote his doctoral dissertation "Polish monarchy and Warmia at the end of the 15th century