Where does “Biskupiec” come from?

Biskupiec (English) comes from Polish Biskupiec, from Polish -iec, from Proto-Slavic -ьcь, from Lithuanian -ikas, from Proto-Indo-European -iḱos — -y, -ic.

Ancestry of “Biskupiec”, step by step

Step	Language	Word	Meaning
1	Polish	Biskupiec	—
2	Polish	-iec	A masculine suffix
3	Proto-Slavic	-ьcь	Forms diminutives from nouns; Forms nouns from...
4	Lithuanian	-ikas	—
5	Proto-Indo-European	-iḱos	-y, -ic

Every word from Proto-Indo-European -iḱos →Every word from Polish -iec →Every word from Proto-Slavic -ьcь →