Where does “Belgrad” come from?

Belgrad (Polish) comes from Serbo-Croatian Bȅograd, from Serbo-Croatian grȃd, from Latin gradus, from Proto-Italic graðus, from Proto-Indo-European gʰradʰ-.

Ancestry of “Belgrad”, step by step

Step	Language	Word	Meaning
1	Serbo-Croatian	Bȅograd	—
2	Serbo-Croatian	grȃd	city
3	Latin	gradus	a step, pace; a stage, degree; a rank
4	Proto-Italic	graðus	—
5	Proto-Indo-European	gʰradʰ-	—

Every word from Proto-Indo-European gʰradʰ- →Every word from Proto-Italic graðus →Every word from Latin gradus →