1)
What is the significance that the nation will come from the north?
1.
Malbim: Refer to 50:3:2:1.
2)
What are "Melachim Rabim"?
1.
Radak #1: They are great and esteemed. This is like "Al Kol Rav Beiso" (Esther 1:8). They are Daryavesh and Koresh.
2.
Radak #2: They are many kings. Kings of other nations came with Daryavesh (Malbim - to help Madai u'Faras), like it says below "Mamlechos Ararat Mini v'Ashkenaz" (51:27).
