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It's called שערי צבי - "Shaarey Tzvi" written by Rav Tzvi Rotter shlit"a (he is the son of the Shaaray Aharon). The book can be found here and can be partially viewed here. Hat tip to sam regarding another book with the same premise, ילקוט מלכו של עולם - "Yalkut Malko Shel Olam", information about it can be found here.
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