Where is the Messiah and his Kingdom?
I think it should be "Where are the Messiah and his kingdom"; it just sounds better! But my friends and even a teacher claim that "is" would be correct.
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It seems to me you could reasonably use "is" if you have a comma after "Messiah". So if we allow discarding a comma (which imho isn't exactly vital), it's just valid elision from...
"Where is the Messiah and [where is] his Kingdom?"