| 21. | He chose the regnal name of Urban IV.
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| 22. | He took the regnal name of Napoleon III.
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| 23. | Upon her abdication, she resumed her pre-regnal marital title and style.
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| 24. | David Dumville has suggested that Cerdic's true regnal dates are 538 554.
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| 25. | These are often at variance with the more extensive information in the Regnal List.
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| 26. | Prince Emmanuel adopted the regnal name Yuhi VI.
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| 27. | Ardo is only recorded in one Visigothic regnal list as reigning for seven years.
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| 28. | The record stops at his 13th regnal year.
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| 29. | A new regnal year begins from a new date, with a new monarch.
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| 30. | Ni Shu chose the regnal name Dulu Khan probably to console the Dulo clan.
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