Where does “神聖ローマ帝国” come from?

神聖ローマ帝国 (Japanese) comes from Japanese ローマ帝国, from Japanese ローマ, from Italian Roma, from Latin Rōma — Rome and/or Constantinople (the latter as "Nova Roma").

Ancestry of “神聖ローマ帝国”, step by step

神聖ローマ帝国 traces back through two separate lines of ancestry.

via Japanese ローマ帝国

Step	Language	Word	Meaning
1	Japanese	ローマ帝国	—
2	Japanese	ローマ	Rome, Roman
3	Italian	Roma	Rome
4	Latin	Rōma	Rome and/or Constantinople (the latter as "Nova Roma")

via Japanese 神聖

Step	Language	Word	Meaning
1	Japanese	神聖	holy, sacred; holiness, sacredness, sanctity
2	Middle Chinese	神聖	—

Every word from Latin Rōma →Every word from Italian Roma →Every word from Japanese ローマ →